Description

In #67136, a logic has been added to check if a custom post type supports author, to prevent author information leakage. However, $block->context may be an empty array in some scenarios, which causes a PHP undefined array key error. One example is when the author has not published any article yet.

Step-by-step reproduction instructions

• Add a new user with the "Editor" role. This user has no posts.
• Add an Author Archives template:

<main class="wp-block-group">
<!-- wp:query-title {"type":"archive"} /-->
<!-- wp:post-author /-->
<!-- wp:post-author-name /-->
</main>
<!-- /wp:group -->

• Access http://localhost:8888/?author=2 (Change the author param value to the actual user id for the newly added user)
• Confirm that two PHP warning logs are displayed.

Screenshots, screen recording, code snippet

Author Archives Template

Frontend

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure