I have a high end Kitchen Aid that's several years old. When it finishes it's cycle, it has a light on. But when you open the door and then close it, the light goes out and stays out until you turn the machine on again.
I have no problem emptying it on Shabbos (as long as I opened and closed it before Shabbos - to check if my kids really left it full), or refilling it (as per my version of Halacha).