So I was playing around with /blockdata and /testforblock with Jukeboxes, I wondered what would happen if I changed the block data to something else. So I tried Prismarine Shards, and they successful where ejected and the music would stop at the same time. So I tried again with Air and Piston Heads, and some strange things happened. Nothing was able to be ejected, and thus the music disc would never stop playing. Even when I broke the Jukebox, nothing "came out" and the disc kept playing.

My solution was to insert a disc into a jukebox in the exact same spot as where the original disc was played, then eject that disc.

What I expected to happen was...:
The music disc stopped playing.

What actually happened was...:
The disc kept playing.

Steps to Reproduce:
1. Place a jukebox.
2. Insert a disc.
3. Run the command
/blockdata x y z {RecordItem:{id:"minecraft:air",Count:1b,Damage:0s}}
or /blockdata x y z {RecordItem:{id:"minecraft:piston_head",Count:1b,Damage:0s}}
but change the x y z to the coordinates of the juke box.
4. Attempt to eject something from the jukebox.
5. Break the jukebox.
6. Observe the disc is still playing.