Avoid None/Int error (#75)

home-assistant/core#139533

Author: CloCkWeRX

sense_energy/sense_api.py

@@ -298,6 +298,8 @@ def trend_update(self, scale: Scale) -> Optional[datetime]:
         update = self.trend_start(scale)
         if not update:
             return None
+        if scale not in self._trend_data or "from_grid" not in self._trend_data[scale]:
+            return None
         val = self._trend_data[scale]["from_grid"] / 100.0
         seconds = int(val)
         microseconds = int((val % 1) * 1000000)