bug#64759: Broken faces

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: 64759@debbugs.gnu.org,  Mauro Aranda <maurooaranda@gmail.com>
> Date: Fri, 21 Jul 2023 11:13:13 +0300
> 
> It seems adding non-empty definitions in bug#64655
> were intended to workaround a bug in cus-edit.el,
> not to fix it.

I don't think it's a bug.  Why is it a bug to tell the user that the
face has no information to show as the current definition?

Moreover, what does it mean to have nil there in defface?  The
meaning of nil is not documented anywhere that I could see, so what
did the authors of such code expect it to produce?