Fixed #14529 -- Fixed representation of model names in admin messages after...

Fixed #14529 -- Fixed representation of model names in admin messages after model object changes when the ModelAdmin queryset() uses defer() or only(). Thanks rlaager for report and initial patch, to rasca an julien for help in tracking the problem.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15596 bcc190cf-cafb-0310-a4f2-bffc1f526a37