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|  | This is a big commit. It is useless to describe in one,
except that we're continuing to futz around with how
upd8.js decides what it's doing. | 
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|  | Sorry these changes are packed together in one commit!
We have no excuse. :+1: | 
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|  | Also disable the fallback behavior when divideTrackListsByGroups
is empty, because what's the use of this listing at all, at that
point...? | 
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|  | And report null directories. | 
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|  | Sorry this commit is kind of monolithic! It's difficult to
separate out any of the changes since they're all related to
track sections' basic functionality. | 
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