docs: def register_error_handler_with_flask_restplus(cls, api, *tasks):
          """
          Registers an error handler for FlaskBuzz derived errors that are
          currently imported. This is useful since flask-restplus
          (prior to 0.11.0) does not handle derived errors. This is probably the
          easist way to register error handlers for FlaskBuzz errors with
          flask-restplus::
  
              FlaskBuzz.register_error_handler_with_flask_restplus(
                  api, print, lambda e: foo(e),
              )
          """
  
          for buzz_subclass in [cls] + cls.__subclasses__():
              api.errorhandler(buzz_subclass)(
                  cls.build_error_handler_for_flask_restplus(*tasks)
              )