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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Commenting empty lines
Date: Tue, 18 May 2021 14:31:25 +0300
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> From: ludvig-faddeev@gmx.com
> Date: Mon, 17 May 2021 22:29:35 +0200
> 
> Have made a keybinding for commenting lines like this
> 
> (global-set-key (kbd "C-;") (kbd "C-x C-;"))
> 
> This means that hitting "C-;" multiple times will comment and uncomment the line.
> 
> But when there is an empty line I want to insert the comment symbol, because
> using "C-;" does not introduce the comment mark.

Did you try setting comment-empty-lines to a non-nil value?