Bug#888237: Make it more obvious when fuzzy matching is not available

[Chris Lamb]

tags 888237 + pending
thanks

Fixed in Git, pending upload:

  https://salsa.debian.org/reproducible-builds/diffoscope/commit/292895cad5c5304cb865f69e980e4edccca2cf0e


Regards,

-- 
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     : :'  :     Chris Lamb
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