add assumed state property

homeassistant/components/switch/tellduslive.py

@@ -40,6 +40,11 @@ class TelldusLiveSwitch(ToggleEntity):
         """ Tells Home Assistant to poll this entity. """
         return True
 
+    @property
+    def assumed_state(self):
+        """Return True if unable to access real state of entity."""
+        return True
+
     @property
     def name(self):
         """ Returns the name of the switch if any. """