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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: file-exists-p on empty string
Date: Wed, 27 Feb 2019 21:16:49 +0200
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> From: lg.zevlg@gmail.com
> Date: Wed, 27 Feb 2019 22:04:15 +0300
> Cc: emacs-devel@gnu.org
> 
> > Why do you need to reject empty strings?
> 
> Filenames are generated externally, and the tool uses empty string notion for no-file semantic

Isn't that un-Emacsy?  Why not nil?