I've used the track parser to enter a tracklist in the form "<artist> - <title>" which the track parser does parse wrong. I then unchecked the "artist" column and let the trackparser parse a tracklist consisting only of "<title>". I then clicked "Next", did nothing on the recording page. When I arrived at the "Missing entities" tab, I was asked to create new artists named like the titles of the tracks (possibly due to them still being in the (disabled) artist column).