Clips where the face moves out of view and back again.

If you are trying to use this on a clip where, for example, the subject briefly turns their head out of view and then back again, it fails with the "face not detected" error.  This can make it very hard to use on some scenes.  Wouldn't it be possible to have the thing just skip over frames with no faces in view?  This would make it much easier to work with some kinds of scenes.