Fix FLUX_LED error when no color is set (#13527)

* Handle turn_on situation when no color is set

As is, an error gets thrown when turn_on is called without an HS value. By adding an if statement, we only try to set RGB if an HS value is applied.

* Fix Whitespace Issues

* Made Requested Changes

homeassistant/components/light/flux_led.py

@@ -204,7 +204,12 @@ class FluxLight(Light):
             self._bulb.turnOn()
 
         hs_color = kwargs.get(ATTR_HS_COLOR)
-        rgb = color_util.color_hs_to_RGB(*hs_color)
+
+        if hs_color:
+            rgb = color_util.color_hs_to_RGB(*hs_color)
+        else:
+            rgb = None
+
         brightness = kwargs.get(ATTR_BRIGHTNESS)
         effect = kwargs.get(ATTR_EFFECT)