[1.1.X] Fixed #12163 -- Corrected the unpickling of non-deferred models....

[1.1.X] Fixed #12163 -- Corrected the unpickling of non-deferred models. Thanks to rfugger for the report and test case.

Backport of r11732 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@11733 bcc190cf-cafb-0310-a4f2-bffc1f526a37