I don't know. What was the name of the level? Did it end up getting a ton of plays? I would suspect an empty level wouldn't generate a lot of happy faces and hearts, and therefore would quickly disappear off cool levels.... but if not, I'd love to see what the result was by seeing the level stats.
I don't quite remember, I'll have to check. I doubt it's on there now, or at least I hope not. But it was some stupid "rare glitch" level, and it was empty except for a few sackbots. I think you're right though, the only happy faces would be those people with absolutely huge senses of humor, are trolls themselves, or helped out with the level (and believe it or not, some people did). My only concern is if others start doing this.