id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
1780	date_hierarchy broken for fields with null=True	mdt@…	Adrian Holovaty	"djando rev#2855 gives error
{{{
   global name 'date_query' is not defined
}}}
in django/db/models/query.py:492:
{{{
   date_query._where.append('%s.%s IS NOT NULL' % 
   ...
}}}
replace date_query with self and everything's fine.
"	defect	closed	contrib.admin		normal	duplicate			Unreviewed	0	0	0	0	0	0