Queue thinks requests still exists even though they are deleted

Summary

Queue expects certain requests to still exist when fetching feedback even though they are soft deleted. Also this exception should not prevent the page from rendering. Maybe we should look into better handeling these exceptions in the back-end so that the page stays usefull.

Steps to reproduce

See sentry

Possible Fix

A student/ta should be able to see the feedback from a deleted lab (and hence also request). Given that it is anonymous, the student doesn't know to what request this is feedback should be attached so this should not be a problem if we stop fetching the request for feedbacks. The real problem occurs with admins who are able to see the request attached to the feedback, for them, we need to find an elegant solution.

Logs