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I added search and filter "not in" to the "Manage ..." dialogs. Once released (or if you run from source now) you can open Manage Authors, type comma in the filter box, then press 'Filter "not in"'. The list will show all authors not containing a comma. You can find only single name authors by typing a space into the box then pressing 'Filter "not in"'.
The same buttons are in "Manage Tags", etc.
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