Misc cleanups (#15907)

* device_tracker.huawei_router: Pylint logging-not-lazy fix

* sensor.irish_rail_transport: Clean up redundant self.info test

homeassistant/components/device_tracker/huawei_router.py

@@ -85,8 +85,7 @@ class HuaweiDeviceScanner(DeviceScanner):
         active_clients = [client for client in data if client.state]
         self.last_results = active_clients
 
-        # pylint: disable=logging-not-lazy
-        _LOGGER.debug("Active clients: " + "\n"
+        _LOGGER.debug("Active clients: %s", "\n"
                       .join((client.mac + " " + client.name)
                             for client in active_clients))
         return True

homeassistant/components/sensor/irish_rail_transport.py

@@ -164,7 +164,7 @@ class IrishRailTransportData:
                           ATTR_TRAIN_TYPE: train.get('type')}
             self.info.append(train_data)
 
-        if not self.info or not self.info:
+        if not self.info:
             self.info = self._empty_train_data()
 
     def _empty_train_data(self):