Handle empty electricity RAW sensors in Tuya (home-assistant#150406)

Author: epenet

homeassistant/components/tuya/models.py

@@ -108,7 +108,7 @@ def from_json(cls, data: str) -> Self:
         raise NotImplementedError("from_json is not implemented for this type")
 
     @classmethod
-    def from_raw(cls, data: str) -> Self:
+    def from_raw(cls, data: str) -> Self | None:
         """Decode base64 string and return a ComplexTypeData object."""
         raise NotImplementedError("from_raw is not implemented for this type")
 
@@ -127,9 +127,11 @@ def from_json(cls, data: str) -> Self:
         return cls(**json.loads(data.lower()))
 
     @classmethod
-    def from_raw(cls, data: str) -> Self:
+    def from_raw(cls, data: str) -> Self | None:
         """Decode base64 string and return a ElectricityTypeData object."""
         raw = base64.b64decode(data)
+        if len(raw) == 0:
+            return None
         voltage = struct.unpack(">H", raw[0:2])[0] / 10.0
         electriccurrent = struct.unpack(">L", b"\x00" + raw[2:5])[0] / 1000.0
         power = struct.unpack(">L", b"\x00" + raw[5:8])[0] / 1000.0

homeassistant/components/tuya/sensor.py

@@ -1555,10 +1555,11 @@ def native_value(self) -> StateType:
             if (
                 self.entity_description.complex_type is None
                 or self.entity_description.subkey is None
+                or (raw_values := self.entity_description.complex_type.from_raw(value))
+                is None
             ):
                 return None
-            values = self.entity_description.complex_type.from_raw(value)
-            return getattr(values, self.entity_description.subkey)
+            return getattr(raw_values, self.entity_description.subkey)
 
         # Valid string or enum value
         return value