0.9.0: execute of template failed at <.Parent.File>: nil pointer evaluating page.Page.File -- error when using page type docs

### Environment

- [x] Version of Docsy you are using: 0.9.0 
- [ ] How are you using Docsy? As a:
 - [x] Hugo module -- `require github.com/google/docsy v0.9.0 // indirect`
 - [ ] NPM module
 - [ ] Git submodule
 - [ ] Other:
- [x] Version of Hugo you are using (output of `hugo version`): 0.122.0 Extended
- [ ] OS:
 - [ ] Linux
 - [x] macOS: `hugo v0.122.0-b9a03bd59d5f71a529acb3e33f995e0ef332b3aa+extended darwin/amd64 BuildDate=2024-01-26T15:54:24Z VendorInfo=brew`
 - [ ] Windows
 - [ ] Other:

### Problem



I first found this issue when updating a new site from 0.8.0 to 0.9.0, first on my own fork, then reconfirmed using the direct from this repo.

Steps to recreate:

1. `hugo new site docs` & `cd docs`

```sh
Congratulations! Your new Hugo site was created in /Users/carl/Projects/temp/docsy-plain-test/docs.

Just a few more steps...

1. Change the current directory to /Users/carl/Projects/temp/docsy-plain-test/docs.
2. Create or install a theme:
 - Create a new theme with the command "hugo new theme <THEMENAME>"
 - Install a theme from https://themes.gohugo.io/
3. Edit hugo.toml, setting the "theme" property to the theme name.
4. Create new content with the command "hugo new content <SECTIONNAME>/<FILENAME>.<FORMAT>".
5. Start the embedded web server with the command "hugo server --buildDrafts".

See documentation at https://gohugo.io/.
```

2. `hugo mod init local.host/temp/docsy-plain-test`

```sh
go: creating new go.mod: module local.host/temp/docsy-plain-test
go: to add module requirements and sums:
	go mod tidy
```

3. `hugo mod get github.com/google/docsy@latest`

```sh
go: downloading github.com/google/docsy v0.9.0
go: added github.com/google/docsy v0.9.0
```

4. Test without any content in place: 

```sh
hugo server
port 1313 already in use, attempting to use an available port
Watching for changes in /Users/carl/Projects/temp/docsy-plain-test/docs/{archetypes,assets,content,data,i18n,layouts,static}
Watching for config changes in /Users/carl/Projects/temp/docsy-plain-test/docs/hugo.toml, /Users/carl/Projects/temp/docsy-plain-test/docs/go.mod
Start building sites …
hugo v0.122.0-b9a03bd59d5f71a529acb3e33f995e0ef332b3aa+extended darwin/amd64 BuildDate=2024-01-26T15:54:24Z VendorInfo=brew

WARN found no layout file for "html" for kind "home": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN found no layout file for "html" for kind "taxonomy": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.

 | EN
-------------------+-----
 Pages | 3
 Paginator pages | 0
 Non-page files | 0
 Static files | 0
 Processed images | 0
 Aliases | 0
 Sitemaps | 1
 Cleaned | 0

Built in 2 ms
Environment: "development"
Serving pages from memory
Running in Fast Render Mode. For full rebuilds on change: hugo server --disableFastRender
Web Server is available at http://localhost:60042/ (bind address 127.0.0.1)
Press Ctrl+C to stop
```

5. Add minimal config: rename `hugo.toml` -> `hugo.yaml` and populate with:

```yml
baseURL: https://localhost:1313/
languageCode: en-gb
title: My New Hugo Site

module:
 proxy: direct
 hugoVersion:
 extended: true
 min: 0.110.0
 imports:
 - path: github.com/google/docsy
 disable: false
```

7. Create `docs/_index.md` with the following content:

```md
---
title: Hello
---

Placeholder

```

8. Test site with `hugo server`


```sh
hugo server
port 1313 already in use, attempting to use an available port
Watching for changes in /Users/carl/Projects/temp/docsy-plain-test/docs/{archetypes,assets,content,data,i18n,layouts,static}
Watching for config changes in /Users/carl/Projects/temp/docsy-plain-test/docs/hugo.yaml, /Users/carl/Projects/temp/docsy-plain-test/docs/go.mod
Start building sites …
hugo v0.122.0-b9a03bd59d5f71a529acb3e33f995e0ef332b3aa+extended darwin/amd64 BuildDate=2024-01-26T15:54:24Z VendorInfo=brew


 | EN
-------------------+-----
 Pages | 7
 Paginator pages | 0
 Non-page files | 0
 Static files | 30
 Processed images | 0
 Aliases | 0
 Sitemaps | 1
 Cleaned | 0

Built in 658 ms
Environment: "development"
Serving pages from memory
Running in Fast Render Mode. For full rebuilds on change: hugo server --disableFastRender
Web Server is available at http://localhost:60575/ (bind address 127.0.0.1)
Press Ctrl+C to stop
```

See a valid plain hugo+docsy page at the test url, all good.

9. Now edit the `_index.md` and add `type: docs` to the frontmatter

```md
---
title: Hello
type: docs
---

Placeholder
```

... and when you save the browser will now show the following error screen:

```html
<div class="error" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Muli, system-ui, -apple-system, &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;, &quot;Noto Sans&quot;, &quot;Liberation Sans&quot;, Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI Symbol&quot;, &quot;Noto Color Emoji&quot;; font-size: 14px;"><div class="highlight" style="overflow-x: auto;"><pre tabindex="0" style="white-space: pre-wrap; overflow-wrap: break-word; font-family: SFMono-Regular, Menlo, Monaco, Consolas, &quot;Liberation Mono&quot;, &quot;Courier New&quot;, monospace; line-height: 1.5; color: rgb(248, 248, 242); background-color: rgb(40, 42, 54); tab-size: 4;"><code class="language-apl" data-lang="apl" style="white-space: pre-wrap; overflow-wrap: break-word; font-family: SFMono-Regular, Menlo, Monaco, Consolas, &quot;Liberation Mono&quot;, &quot;Courier New&quot;, monospace;"> render: failed to render pages: render of "home" failed: [1;36m"/Users/carl/.local/share/hugo/modules/filecache/modules/pkg/mod/github.com/google/docsy@v0.9.0/layouts/docs/list.html:12:5"[0m: execute of template failed at &lt;partial "section-index.html" .&gt;: error calling partial: [1;36m"/Users/carl/.local/share/hugo/modules/filecache/modules/pkg/mod/github.com/google/docsy@v0.9.0/layouts/partials/section-index.html:7:17"[0m: execute of template failed at &lt;.Parent.File&gt;: nil pointer evaluating page.Page.File </code></pre></div></div><hr style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; margin-bottom: 1rem; border: medium; height: 1px; background-color: rgb(61, 61, 61); font-family: Muli, system-ui, -apple-system, &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;, &quot;Noto Sans&quot;, &quot;Liberation Sans&quot;, Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI Symbol&quot;, &quot;Noto Color Emoji&quot;; font-size: 14px;"><code class="filename" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; overflow-wrap: break-word; font-family: SFMono-Regular, Menlo, Monaco, Consolas, &quot;Liberation Mono&quot;, &quot;Courier New&quot;, monospace; color: rgb(238, 247, 138); font-size: 0.9rem; line-height: 1.5;">/Users/carl/.local/share/hugo/modules/filecache/modules/pkg/mod/github.com/google/docsy@v0.9.0/layouts/docs/list.html:12:5:</code><span style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Muli, system-ui, -apple-system, &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;, &quot;Noto Sans&quot;, &quot;Liberation Sans&quot;, Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI Symbol&quot;, &quot;Noto Color Emoji&quot;; font-size: 14px; background-color: rgb(39, 42, 54); float: none; display: inline !important;"><div class="highlight" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; overflow-x: auto; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Muli, system-ui, -apple-system, &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;, &quot;Noto Sans&quot;, &quot;Liberation Sans&quot;, Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI Symbol&quot;, &quot;Noto Color Emoji&quot;; font-size: 14px;"><div style="color: rgb(248, 248, 242); background-color: rgb(40, 42, 54); tab-size: 4; display: grid;">
  | </header> 	{{ .Content }} {{ partial "section-index.html" . -}} 	{{ partial "feedback.html" . -}} 	{{ if (.Site.DisqusShortname) -}}
-- | --


</div></div><hr style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; margin-bottom: 1rem; border: medium; height: 1px; background-color: rgb(61, 61, 61); font-family: Muli, system-ui, -apple-system, &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;, &quot;Noto Sans&quot;, &quot;Liberation Sans&quot;, Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI Symbol&quot;, &quot;Noto Color Emoji&quot;; font-size: 14px;"><p class="version" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-size: 0.75rem; color: rgb(124, 124, 124); font-family: Muli, system-ui, -apple-system, &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;, &quot;Noto Sans&quot;, &quot;Liberation Sans&quot;, Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI Symbol&quot;, &quot;Noto Color Emoji&quot;;">hugo v0.122.0-b9a03bd59d5f71a529acb3e33f995e0ef332b3aa+extended darwin/amd64 BuildDate=2024-01-26T15:54:24Z VendorInfo=brew<a href="" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(5, 148, 203); text-decoration: none; font-family: Muli, system-ui, -apple-system, &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;, &quot;Noto Sans&quot;, &quot;Liberation Sans&quot;, Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI Symbol&quot;, &quot;Noto Color Emoji&quot;; font-size: 14px;">Reload Page</a>render: failed to render pages: render of "home" failed: [1;36m"/Users/carl/.local/share/hugo/modules/filecache/modules/pkg/mod/github.com/google/docsy@v0.9.0/layouts/docs/list.html:12:5"[0m: execute of template failed at <partial "section-index.html" .>: error calling partial: [1;36m"/Users/carl/.local/share/hugo/modules/filecache/modules/pkg/mod/github.com/google/docsy@v0.9.0/layouts/partials/section-index.html:7:17"[0m: execute of template failed at <.Parent.File>: nil pointer evaluating page.Page.File 
/Users/carl/.local/share/hugo/modules/filecache/modules/pkg/mod/github.com/google/docsy@v0.9.0/layouts/docs/list.html:12:5:
	</header>
	{{ .Content }}
 {{ partial "section-index.html" . -}}
	{{ partial "feedback.html" . -}}
	{{ if (.Site.DisqusShortname) -}}
/Users/carl/.local/share/hugo/modules/filecache/modules/pkg/mod/github.com/google/docsy@v0.9.0/layouts/partials/section-index.html:7:17:
 {{ $pages = (where $pages ".Params.hide_summary" "!=" true) -}}
 {{ $pages = (where $pages ".Parent" "!=" nil) -}}
 {{ if .Parent.File -}}
 {{ $pages = (where $pages "Parent.File.UniqueID" "==" $parent.File.UniqueID) -}}
 {{ end -}}
hugo v0.122.0-b9a03bd59d5f71a529acb3e33f995e0ef332b3aa+extended darwin/amd64 BuildDate=2024-01-26T15:54:24Z VendorInfo=brew

[Reload Page](https://github.com/google/docsy/issues/new?assignees=&labels=bug%2Cneeds-triage&projects=&template=bug.md)
```

and the command line echos this with:

```sh
Change detected, rebuilding site.
2024-02-15 22:05:30.764 +0000
Source changed WRITE "/Users/carl/Projects/temp/docsy-plain-test/docs/content/_index.md"
ERROR Rebuild failed: render: failed to render pages: render of "home" failed: "/Users/carl/.local/share/hugo/modules/filecache/modules/pkg/mod/github.com/google/docsy@v0.9.0/layouts/docs/list.html:12:5": execute of template failed at <partial "section-index.html" .>: error calling partial: "/Users/carl/.local/share/hugo/modules/filecache/modules/pkg/mod/github.com/google/docsy@v0.9.0/layouts/partials/section-index.html:7:17": execute of template failed at <.Parent.File>: nil pointer evaluating page.Page.File
Total in 6 ms
```

I've tried this on about 5 different sites (old and new) and it all narrows down to setting the `type: docs`, and this partial coming up as the fault. I haven't yet found a fix... but I'm puzzled as to if I'm the doing something wrong to have been the first to report this...?

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0.9.0: execute of template failed at <.Parent.File>: nil pointer evaluating page.Page.File -- error when using page type docs #1863

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0.9.0: execute of template failed at <.Parent.File>: nil pointer evaluating page.Page.File -- error when using page type docs #1863

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