def has_subscribers(self):
        with self.lock:
            ret = len(self.subscriptions) != 0
            return ret
If the configuration file does not exist, ``NoConfiguration`` is raised.
dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_library/src/rosbridge_library/internal/subscribers.py/MultiSubscriber.has_subscribers--crossover with--dataset/ETHPy150Open ClusterHQ/powerstrip/powerstrip/test/test_config.py/ReadAndParseTests.test_no_config