It definitely played. I usually play with the music off, but I turned it on for my final day in the game. I will admit I got a little choked up listening to it just now. Goodnight Glitchen!
The Goodnight Groddle musicblock has been suggested after every single test since Goodnight Groddle was created, even before it played at end of test...Hopefully that will be a new item by the time we re-open!