[1.0.X] Fixed #10069 -- Fixed the model form unique validation code to not...

[1.0.X] Fixed #10069 -- Fixed the model form unique validation code to not proceed with using, for example, RelatedObjects returned by get_field_by_name as though they were model Fields.

r9777 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9778 bcc190cf-cafb-0310-a4f2-bffc1f526a37