fix: if support page is not set, help button does not appears in header

[lkatsikaris]

Fix: if the support page is not set, the help button does not appear in the header

Fixex #373

What changed?

• If the SUPPORT PAGE variable is not set or is empty, the help button does not appear in the header nav.

Developer Checklist

• Test suites passing
• Documentation and test plan updated, if applicable
• Received code-owner approving review
• Bumped version number package.json

Reviewer Checklist

Collectively, these should be completed by reviewers of this PR:

• I've done a visual code review
• I've tested the new functionality

[openedx-webhooks]

Thanks for the pull request, @lkatsikaris!

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[MaxFrank13]

Thanks for the contribution @lkatsikaris. Unfortunately, the header has been refactored as of #327 and there are conflicts with this PR as a result. If you'd like to refactor your implementation to match the latest in master, we'll be happy to take another look. I'll add the appropriate labels for us to keep track of this as well.

[lkatsikaris]

Yes, @MaxFrank13 I can work on that!