bug#49782: 28.0.50; set-fontset-font crashes in init (server)

[Eli Zaretskii]

> Date: Fri, 30 Jul 2021 23:12:09 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 49782@debbugs.gnu.org
> 
> > Date: Fri, 30 Jul 2021 23:02:37 +0300
> > From: Eli Zaretskii <eliz@gnu.org>
> > Cc: 49782@debbugs.gnu.org
> > 
> > > But that additional condition re-introduces the original problem.
> > 
> > Then I'll need a backtrace from a live Emacs process with "xbacktrace"
> > results as well, and in a build without optimizations, so I could see
> > what's the difference between these two use cases.
> 
> But before you embark on that adventure, please try another stab in
> the dark:

I installed that on the master branch, please test.

Thanks.