[1.1.X] Fixed #12286: Ensure proxied model's table is created.

Thanks to telenieko for the report and flyingfred0 for test and fix.

Test is r12828 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12829 bcc190cf-cafb-0310-a4f2-bffc1f526a37