Update missed legacy raise-message

Author: bouwew

plugwise/legacy/smile.py

@@ -126,7 +126,7 @@ async def async_update(self) -> PlugwiseData:
                 # Detect failed data-retrieval
                 _ = self.gw_entities[self.gateway_id]["location"]
             except KeyError as err:
-                raise DataMissingError("No Plugwise data received") from err
+                raise DataMissingError("No (full) Plugwise legacy data received") from err
         # Otherwise perform an incremental update
         else:
             try: