chore: Refactor RemainingRangeSensor and ClimateControlSwitch

Fixes runtime errors when the data is missing

custom_components/nissan_carwings/sensor.py

@@ -100,11 +100,12 @@ def __init__(self, coordinator: CarwingsDataUpdateCoordinator, *, is_ac_on: bool
     @property
     def native_value(self) -> float | None:
         """Battery range in miles or kms."""
+        data: pycarwings3.responses.CarwingsLatestBatteryStatusResponse = self.coordinator.data[DATA_BATTERY_STATUS_KEY]
         ret: float | None
         if self._ac_on:
-            ret = self.coordinator.data[DATA_BATTERY_STATUS_KEY].cruising_range_ac_on_km
+            ret = data.cruising_range_ac_on_km
         else:
-            ret = self.coordinator.data[DATA_BATTERY_STATUS_KEY].cruising_range_ac_off_km
+            ret = data.cruising_range_ac_off_km
 
         if ret is None:
             return None
@@ -121,6 +122,13 @@ def native_unit_of_measurement(self) -> str:
             return UnitOfLength.MILES
         return UnitOfLength.KILOMETERS
 
+    @property
+    def available(self) -> bool:
+        """Sensor availability."""
+        data: pycarwings3.responses.CarwingsLatestBatteryStatusResponse = self.coordinator.data[DATA_BATTERY_STATUS_KEY]
+        attr = "cruising_range_ac_on_km" if self._ac_on else "cruising_range_ac_off_km"
+        return hasattr(data, attr)
+
 
 class BatteryCapacitySensor(NissanCarwingsEntity, SensorEntity):
     """Current Battery Capacity Sensor."""

custom_components/nissan_carwings/switch.py

@@ -57,7 +57,8 @@ def is_on(self) -> bool:
         data: pycarwings3.responses.CarwingsLatestClimateControlStatusResponse = self.coordinator.data[
             DATA_CLIMATE_STATUS_KEY
         ]
-        return data.is_hvac_running
+        # assume the AC is not running when the data is not available
+        return data.is_hvac_running if data else False
 
     async def async_turn_on(self, **_: Any) -> None:
         """Turn on the switch."""