Add defult methods to base class for switch_state and sensor_state

homeassistant/components/switch/__init__.py

@@ -108,6 +108,16 @@ class SwitchDevice(ToggleEntity):
         """ Today total power usage in mw. """
         return None
 
+    @property
+    def standby_state(self):
+        """ Is the device on - or in standby. """
+        return None
+
+    @property
+    def sensor_state(self):
+        """ Is the sensor on or off. """
+        return None
+
     @property
     def device_state_attributes(self):
         """ Returns device specific state attributes. """