Fix error when accepting appeal for sensitive posts deleted in the meantime

[ClearlyClaire]

When a moderator tries to accept an appeal for a mark-statuses-as-sensitive action but the statuses have been suspended in the meantime, the controller would error out because it is trying to undo the change on the status, creating a StatusEdit in the process.

This would fail with:

ActiveRecord::RecordInvalid: Validation failed: Status must exist

Because of the default scope on Status.

An alternative could be to unscope the default scope in StatusEdit's belongs_to…

[mjankowski]

Could the coverage here go on the services spec and add this edge case ... or is there some outcome/aspect of this that's really only visible at the controller level despite the change being in the service?

[ClearlyClaire]

Could the coverage here go on the services spec and add this edge case ... or is there some outcome/aspect of this that's really only visible at the controller level despite the change being in the service?

This can definitely go in the service spec.

EDIT: done