Fixed #2086 -- Changed `base.css` to import `null.css` (added in [6197]) instead of `null`.
Fixed #2086 -- Changed `base.css` to import `null.css` (added in [6197]) instead of `null`.

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extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%406716

adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel