Improved model validator so that it validates admin.list_display values
Improved model validator so that it validates admin.list_display values

git-svn-id: http://code.djangoproject.com/svn/django/trunk@650 bcc190cf-cafb-0310-a4f2-bffc1f526a37

--HG--
extra : convert_revision : 57e37bd6dd28e0aea98f816b2b468e6d7457fbfa

heracek/django-nonrel,heracek/django-nonrel,heracek/django-nonrel,adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel