f95be6a0dfe6685db97f0accb5ca4e8fb0885249
* Add constants for sensor device_class * Add device_class attribute to sensor component * Add device_class attribute to sensor class * Add device_class to mhz19 temperature sensor * Add device_class to sensor in api component * Add test for device_class of sensor * Rename DEVICE_CLASS_NONE to DEVICE_CLASS_EMPTY for consistency * Make optional attributes of sensor component truly optional
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