Fix 'native_unit_of_measurement' is None

custom_components/idrac_power/sensor.py

@@ -81,6 +81,7 @@ def __init__(self, hass, rest: IdracRest, device_info, unique_id, name):
             key='current_power_usage',
             name=name,
             icon='mdi:lightning-bolt',
+            native_unit_of_measurement='W',
             device_class=SensorDeviceClass.POWER,
             state_class=SensorStateClass.MEASUREMENT
         )