bug#16819: 24.3.50; emacs_backtrace.txt

[Eli Zaretskii]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Thu, 20 Feb 2014 11:45:59 +0100
> Cc: 16819@debbugs.gnu.org
> 
> > This looks almost like bug #16801, which has been fixed (but after the
> > build I am using here).  Perhaps it is the same?
> 
> It happens in another source file.
> 
> init_iterator at xdisp.c:2931

Thanks.  Bad (null?) face pointers strike again.

I committed a trivial fix, let's see if it fixes this.