Fix for home-assistant/core#81082

Author: rozie

pymelcloud/device.py

@@ -218,7 +218,12 @@ def daily_energy_consumed(self) -> Optional[float]:
         consumption = 0
 
         for mode in ['Heating', 'Cooling', 'Auto', 'Dry', 'Fan', 'Other']:
-            consumption += self._energy_report.get(mode, [0.0])[-1]
+            previous_reports = self._energy_report.get(mode, [0.0])
+            if previous_reports:
+                last_report = previous_reports[-1]
+            else:
+                last_report = 0.0
+            consumption += last_report
 
         return consumption