def METHOD_NAME(self, *args, **kwargs):
    for field_object in self.model._meta.get_fields():
        direct = not field_object.auto_created or field_object.concrete
        if direct and hasattr(field_object, 'Empty'):
            for suffix in ('', '_exact'):
                key = f'{field_object.name}{suffix}'
                if key in kwargs and kwargs[key] is None:
                    kwargs[key] = field_object.Empty
    return super().METHOD_NAME(*args, **kwargs)