fix(app-degree-pages): fixed error in anchor menu detail page

[davidornelas11]

Description

There was a console error in the Degree Detail page when there was no anchor menu present. This was caused by trying to render the AnchorMenu even if there was no valid anchor menu items

Links

• Unity reference site
• JIRA ticket

FOR APPROVERS

• Percy build approval

Checklist

• [ ] Unity project successfully builds from root yarn install & yarn build
• [ ] Commits do not contain multiple scopes
• [ ] Add/updated examples
• [ ] Add/updated READMEs/docs
• [ ] No new console errors
• [ ] Accessibility checks

Browsers

• [ ] Chrome
• [ ] Safari
• [ ] Firefox
• [ ] Edge

Images