Make gardena closing sensor unavailable when closed (#98133)

homeassistant/components/gardena_bluetooth/sensor.py

@@ -117,3 +117,8 @@ class GardenaBluetoothRemainSensor(GardenaBluetoothEntity, SensorEntity):
             self._attr_native_value = time
             super()._handle_coordinator_update()
             return
+
+    @property
+    def available(self) -> bool:
+        """Sensor only available when open."""
+        return super().available and self._attr_native_value is not None

tests/components/gardena_bluetooth/snapshots/test_sensor.ambr

@@ -35,7 +35,7 @@
     'entity_id': 'sensor.mock_title_valve_closing',
     'last_changed': <ANY>,
     'last_updated': <ANY>,
-    'state': 'unknown',
+    'state': 'unavailable',
   })
 # ---
 # name: test_setup[98bd2a19-0b0e-421a-84e5-ddbf75dc6de4-raw0-sensor.mock_title_battery]