What does this PR do?

fixes Having a FormField with a null or false child

Where should the reviewer start?

formfield.js

What testing has been done on this PR?

storybook

How should this be manually tested?

<FormField>
        <TextInput />
        {false && <Text>foobar</Text>}
</FormField>

Do Jest tests follow these best practices?

• screen is used for querying.
• The correct query is used. (Refer to this list of queries)
• asFragment() is used for snapshot testing.

Any background context you want to provide?

What are the relevant issues?

closes #7180

Screenshots (if appropriate)

Do the grommet docs need to be updated?

no

Should this PR be mentioned in the release notes?

sure

Is this change backwards compatible or is it a breaking change?

backwards compatible