Follow-up to r9656 -- beef up the added test to exercise all (one can hope)...

Follow-up to r9656 -- beef up the added test to exercise all (one can hope) paths through the troublesome get_deleted_objects function and fix the resulting errors.

Refs #9859.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9657 bcc190cf-cafb-0310-a4f2-bffc1f526a37