Fixed #2190 -- Now allowing NullBooleanField to be given None
Fixed #2190 -- Now allowing NullBooleanField to be given None

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%403161

Belgabor/django,Belgabor/django,Belgabor/django