fix(ui): avoid empty div when there are no externalDocs

[matyjas]

Relocate div for externalDocs into conditional checking for existence of externalDocs entry.

Description

• Move div into the conditional
• Ran prettier on the file

Motivation and Context

Fixes #7996

How Has This Been Tested?

Manually tested on macOS with and without externalDocs

Screenshots (if appropriate):

Checklist

My PR contains...

• No code changes (src/ is unmodified: changes to documentation, CI, metadata, etc.)
• Dependency changes (any modification to dependencies in package.json)
• Bug fixes (non-breaking change which fixes an issue)
• Improvements (misc. changes to existing features)
• Features (non-breaking change which adds functionality)

My changes...

• are breaking changes to a public API (config options, System API, major UI change, etc).
• are breaking changes to a private API (Redux, component props, utility functions, etc.).
• are breaking changes to a developer API (npm script behavior changes, new dev system dependencies, etc).
• are not breaking changes.

Documentation

• My changes do not require a change to the project documentation.
• My changes require a change to the project documentation.
• If yes to above: I have updated the documentation accordingly.

Automated tests

• My changes can not or do not need to be tested.
• My changes can and should be tested by unit and/or integration tests.
• If yes to above: I have added tests to cover my changes.
• If yes to above: I have taken care to cover edge cases in my tests.
• All new and existing tests passed.

[tim-lai]

@matyjas Thanks for the PR! Looks good to me, though could you add a Cypress test or two that compares and verifiies the two cases as noted in your screenshot?

[tim-lai]

related to PR #7559

[tim-lai]

@matyjas PR merged! Thanks for the fix!