Handle edge case where menu is not defined.

[timcosgrove]

Description

These changes handle an edge case where a facility-connected page does not have an active VAMC system; see more details in the ticket.

Ticket

department-of-veterans-affairs/va.gov-cms#19759

Developer Task

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1. PR submitted against the main branch of next-build.
2. Link to the issue that this PR addresses (if applicable).
3. Define all changes in your PR and note any changes that could potentially be breaking changes.
4. PR includes steps to test your changes and links to these changes in the Tugboat preview (if applicable).
5. Provided before and after screenshots of your changes (if applicable).
6. Alerted the #accelerated-publishing Slack channel to request a PR review.
7. You understand that once approved, you are responsible for merging your changes into main. (Note that changes to main will move automatically into production.)

QA steps

• You can visit https://pr804-llcydhvxaqlyr8b0nvcj0l3dpmdwljlr.tugboat.vfs.va.gov/outreach-and-events/events/ and there is a built page.
• You visit https://pr804-llcydhvxaqlyr8b0nvcj0l3dpmdwljlr.tugboat.vfs.va.gov/manila-va-clinic/stories/ and there is a built page (it will say 'coming soon' and it will not have a Facility menu).
• - [ ] You visit https://pr804-llcydhvxaqlyr8b0nvcj0l3dpmdwljlr.tugboat.vfs.va.gov/pittsburgh-health-care/stories/ and there is a built page with a facility sidebar menu.

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1. Code Quality: Readabilty, Naming Conventions, Consistency, Reusability
2. Test Coverage: 80% coverage
3. Functionality: Change functions as expected with no additional bugs
4. Performance: Code does not introduce performance issues
5. Documentation: Changes are documented in their respective README.md files
6. Security: Packages have been approved in the TRM

[timcosgrove]

These match what was already in events.

[edmund-dunn]

Looks good!