Fixed #17274 -- Accepted TIME_ZONE = None when USE_TZ = True. Thanks pressureman for the report.

This problem only occured when pytz is installed. It's still strongly recommended to define the correct time zone in TIME_ZONE in order to use pytz' implementation and not the approximation based on system time.



git-svn-id: http://code.djangoproject.com/svn/django/trunk@17134 bcc190cf-cafb-0310-a4f2-bffc1f526a37