Fix key error in clean func

Author: wernerhp

custom_components/load_shedding/manifest.json

@@ -15,5 +15,5 @@
     "@wernerhp"
   ],
   "iot_class": "cloud_polling",
-  "version": "1.0.0"
+  "version": "1.0.1"
 }

custom_components/load_shedding/sensor.py

@@ -621,6 +621,8 @@ def get_sensor_attrs(forecast: list, stage: Stage = Stage.NO_LOAD_SHEDDING) -> d
 def clean(data: dict) -> dict:
     """Remove default values from dict"""
     for (key, value) in DEFAULT_DATA.items():
+        if key not in data:
+            continue
         if data[key] == value:
             del data[key]