When I have a single video with an audio track and the config parameter atLeastOneVide is set to false I'm not able to deselect the video in the track selection to produce an audio only publication. If I go to the "Tracks" section the message "Track selection is disabled for this video, because at least two tracks are required to deselect any." is displayed:

If I use the editor with a dual track video, I'm able to deselect both videos: