Aubess 1gang switch: make energy optional

Some devices seem to not return energy (or maybe only some of the time)

Issue #454

custom_components/tuya_local/devices/aubess_1gang_switch.yaml

@@ -54,6 +54,7 @@ secondary_entities:
       - id: 20
         name: sensor
         type: integer
+        optional: true
         unit: Wh
   - entity: sensor
     name: Current