def get_argument_component(self):
try:<EOL><INDENT>component = self.get_argument(constants.PARAM_COMPONENT)<EOL>return component<EOL><DEDENT>except tornado.web.MissingArgumentError as e:<EOL><INDENT>raise Exception(e.log_message)<EOL><DEDENT>
Helper function to get component argument.
Raises exception if argument is missing.
Returns the component argument.