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We now skip this particular check on Oracle backends. Change is based on a backend feature check, so it also works with other backends that may treat NULL as equal to an empty string. Fixes #16694 (with luck). git-svn-id: http://code.djangoproject.com/svn/django/trunk@16681 bcc190cf-cafb-0310-a4f2-bffc1f526a37