FIX: SensorDataChangeEvent trigger logic

The event should be skipped only if new_data is null or an empty,
list/object, not if it contains
a zero/false-y value.

platypush/backend/sensor/__init__.py

@@ -175,7 +175,7 @@ class SensorBackend(Backend):
             plugin.close()
 
     def process_data(self, data, new_data):
-        if new_data:
+        if new_data is not None and data not in ({}, []):
             self.bus.post(SensorDataChangeEvent(data=new_data, source=self.plugin or self.__class__.__name__))
 
     def run(self):