def get_multiple_choices_required(self):
errors = []<EOL>if self.required:<EOL><INDENT>msg = _("<STR_LIT>")<EOL>errors.append(('<STR_LIT>', msg))<EOL><DEDENT>return errors<EOL>
Add only the required message, but no 'ng-required' attribute to the input fields,
otherwise all Checkboxes of a MultipleChoiceField would require the property "checked".