NavList: Only render the group title if title exists

[broccolinisoup]

While testing PageHeader integration at dotcom, I came across an axe violation error (internally accessible only)

Headings should not be empty (empty-heading)

and realised that it was introduced by #4593 (Apologies!) - This PR fixes it.

Disclaimer: I don't think the title prop should be optional in terms of the accessibility requirements since each group needs to have a heading regardless it is visible or not but I'll raise an issue for this.

Changelog

New

Changed

• Conditionally render the heading component. I.e. only when title exists

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; Since the main PR hasn't released yet and it has a changeset, I think it is fine to skip changeset here.

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6e24806

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	88.56 KB (+0.04% 🔺)
packages/react/dist/browser.umd.js	88.9 KB (+0.07% 🔺)

[siddharthkp]

Thank you!