Fix mysensors rgb light (#52604)
Fix mysensors rgb light (#52604)

* remove assert self._white as not all RGB will have a white channel

* suggested change

* Update homeassistant/components/mysensors/light.py

Co-authored-by: Erik Montnemery <c195b508e6f0c57aeafdb5e96947e2b79e6a4b40@montnemery.com>

Co-authored-by: Franck Nijhof <13eb18b733a08718cb4c9e1db0ca6f4a03c9262b@frenck.nl>
Co-authored-by: Erik Montnemery <c195b508e6f0c57aeafdb5e96947e2b79e6a4b40@montnemery.com>
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