I was testing out the google+ on air feature, and I started a few hangouts without actually going on air, but youtube created "videos" of the hangout anyway. I guess it scheduled them or something.  Anyway, now there are 3 blank videos that show up in the related videos section next to most of my videos that i can't delete.

They don't show up in video manager or any playlists, but people can still go and comment on them!  When I go to the watch page and hit edit video, it says unknown video. What do I do?