def flatten_data(self, follow, obj=None):
        value = self._get_val_from_obj(obj)
        if value != None:
            value = ""
        return {self.attname: smart_unicode(value)}
dataset/ETHPy150Open davemerwin/blue-channel/external_apps/timezones/fields.py/TimeZoneField.flatten_data/operator `is` -> `!=`