Description of problem:

This PR https://github.com/janus-idp/backstage-plugins/pull/1493 hides rbac frontend if rbac backend is disabled. Going to rbac route when rbac frontend is hidden, this  empty state  https://www.figma.com/design/E6C9X3OSVzlWkW7ZsbxN7s/Administration?node-id=4507%3A4016&t=nzHQ4KsEsPWKLkd7-1 should be shown instead of a black page.

Steps to Reproduce

1. Disable rbac backend
2. Go to route /rbac

Actual results:

Empty screen is shown

Expected results:

Correct empty state should be shown

Additional info :

https://github.com/janus-idp/backstage-plugins/pull/1493#issuecomment-2100475654 **