Fix mypy error

bouwew · bouwew · commit feee7000684e · 2022-04-13T19:43:23.000+02:00
diff --git a/plugwise/helper.py b/plugwise/helper.py
@@ -488,6 +488,8 @@ def _energy_device_info_finder(self, appliance: etree, appl: Munch) -> Munch | N
 
             return appl
 
+        return None
+
     def _appliance_info_finder(self, appliance: etree, appl: Munch) -> Munch:
         """Collect device info (Smile/Stretch, Thermostats, OpenTherm/On-Off): firmware, model and vendor name."""
         # Collect gateway device info
