Notification if no output device

[dtsig]

On this computer I have a mini library (only a couple K tracks) that i play with. No speaker but I use bluetooth headphones.
IF the headphones are off, forget to turnon, MMW will skip through all tracks as if they have been moved. This should respond like Grove does by popping up a message that there is no output device and then simply stop. This should be incorporated into MMW5 also