A preference called browserNagIfNoClassComment
is added and set to true. When a class with no comment is 
selected in the browser a notifier pops up 
telling the class is not commented.

Maybe this could generate enough friction to make people write
comments. This preference could be included and turned on in a alpha and beta
stages of image releases.

v3 Class name in notifier.

v2 Simplified the check for empty comment.

Karl
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