* Fix light.turn_on for emulated_hue
HarmonyHub sends `{'xy': [0, 0], 'on': True, 'bri': 0}` when turning on lights that do not support brightness control. Unfortunately current logic always uses brightness value to control on/off state which makes no sense for lights that don't support brightness at all. This change fixes that behavior, making light without brightness control usable with HarmonyHub and probably some other remotes.
* Test 'no_brightness' lights