Don't delete external_id and data attributes unless they are set

platypush/plugins/light/hue/__init__.py

@@ -1177,7 +1177,9 @@ class LightHuePlugin(RunnablePlugin, LightPlugin):
             for attr, value in (light.data or {}).items():
                 setattr(light, attr, value)
 
+            if light.external_id is not None:
                 del light.external_id
+            if light.data is not None:
                 del light.data
 
         return lights