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* add note on is_state_attr Added a note about is_state_attr when attribute's value is None. Based on https://community.home-assistant.io/t/can-someone-please-explain/128041 and https://community.home-assistant.io/t/is-state-attr-with-none-argument-to-test/173723 * ✏️ Tweak Co-authored-by: Franck Nijhof <frenck@frenck.nl>