Bug 24213: Fix Koha::Object->get_from_storage if the object has been deleted

Bug 24213: Fix Koha::Object->get_from_storage if the object has been deleted

Without this patch it fails with something like:
  DBIC result _type  isn't of the _type Subscription at t/db_dependent/Biblio.t line 627.

Test plan:
- Apply the first patch (Add tests)
- Confirm that they fail
- Apply this patch
- Confirm that the tests pass

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>