Tightened up some code in django.core.validators
Tightened up some code in django.core.validators

git-svn-id: http://code.djangoproject.com/svn/django/trunk@404 bcc190cf-cafb-0310-a4f2-bffc1f526a37

--HG--
extra : convert_revision : 9b65ebf87499a50a1a63f26c47e4d60358dd12bf

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