add failing test case for filtering a fake queryset
add failing test case for filtering a fake queryset

this could be fixed by undoing the `get` method hack, but is it even
needed?

goldblatt/django-object-actions,goldblatt/django-object-actions,dukebody/django-object-actions,Cuuuurzel/django-object-actions,Cuuuurzel/django-object-actions,dukebody/django-object-actions,crccheck/django-object-actions,crccheck/django-object-actions