def get_multiple_choices_required(self):
        errors = []
        if self.required:
            for key, msg in self.error_messages.items():
                if key == 'required':
                    errors.append(('$error.required', msg))
        return errors
Add only the required message, but no 'ng-required' attribute to the input fields,
dataset/ETHPy150Open jrief/django-angular/djng/forms/field_mixins.py/MultipleFieldMixin.get_multiple_choices_required