bugfix: MealyMachine.simulate checked selected state with if not state to stop simulation, which fails when selecting state 0. Replaced by is None.
bugfix: MealyMachine.simulate checked selected state with if not state to stop simulation, which fails when selecting state 0. Replaced by is None.

tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control