Fixed some Python 2.3 unicode conversion problems. Uncovered by the tests, but...

Fixed some Python 2.3 unicode conversion problems. Uncovered by the tests, but that was just a sign of a real bug (luckily!).


git-svn-id: http://code.djangoproject.com/svn/django/trunk@6266 bcc190cf-cafb-0310-a4f2-bffc1f526a37