'If a widget was converted and the Form data was submitted through a multipart request,
then these data fields must be converted to suit the Django Form validation'

def rectify_multipart_form_data(self, data):

    for (name, field) in self.base_fields.items():
        try:
            field.implode_multi_values(name, data)
        except AttributeError:
            pass
    return data
