Breaking an active jukebox doesn't destroy the block

When a jukebox (record player) is playing a music disc it is "indestructible". Attempting to break it in any way (pick, axe, creative mode, tnt) will cause the jukebox to eject the disk only - the actual jukebox block will remain in the world. Once it is empty and not playing any more it can be broken again, but only when it is empty.

Works fine in 14w21b.