Fixed #7181 -- when ordering by a potentially NULL field, use a left-…
so that the ordering doesn't accidentally restrict the result set.
(Ironically, one existing test actually showed this problem, but I was too
dumb to notice the result was incorrect.)
git-svn-id: http://code.djangoproject.com/svn/django/trunk@7761 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Jun 26, 2008