If a FileField with null=True is set to None, the db stores '' in the
db and not NULL as I would expect.
Also, if a FileField has both blank=True and null=True a ModelForm
without a file will save '' in the db, not sure if this is the desired
behaviour.
So the question is should the behaviour be as-is and if not is the
correct place to solve it in get_db_prep_value?
Example of code that this issue affects:
Model.objects.filter(filefield=u'') seems wrong as compared to
Model.objects.filter(filefield__isnull=True)
Model.objects.aggregate(Count('filefield')) i would expect this to
count objects with a file and not those without a file.
This may relate to other fields aswell, if a field has both blank=True
and null=True should it not store NULL in the db?
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