django-imagekit

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Only noticed this while mocking out branch coverage for a custom namer (which essentially copies most of source_name_dot_hash):

if source_filename becomes None because for whatever reason generator.source does not have a name attribute, then attempting to get the basename will fail because AttributeError: 'NoneType' object has no attribute 'rfind' deep inside os.path.basename()

As an aside, it was a touch difficult to figure out was going on because doing dir(generator) inside a debugging session didn't work, because the builtin dir() is clobbered by the dir = assignment.