Delete empty bin/folder gives warning "…contains clip references"
Premiere Productions. I'm doing some re-orgnization (in the project, not at OS level). I've emptied out a group of nested folders. They are empty, no clips no sequences. But when I try to delete teh top leve folder I am given the "…contains clip references…" warning (see below). I've narrowed it down to two folders, but they seem to be empty folders just like the others.
Why the warning? Should I ignore it an just delete the folders?

