bug#29923: [PATCH] Skip writing empty abbrev tables

[Eli Zaretskii]

> From: Allen Li <darkfeline@felesatra.moe>
> Date: Tue, 18 Sep 2018 19:55:38 -0700
> Cc: Allen Li <vianchielfaura@gmail.com>, 29923@debbugs.gnu.org
> 
> > Ah, it would be good to have this information in the commit message, as
> > the patch is a bit confusing to read otherwise.
> 
> Done.  I have also removed the system abbrev check in abbrev--write since
> it is redundant now and this is the only place it is called.

I think this change in behavior warrants a NEWS entry, and I think the
description in the ELisp manual should also be updated.

> To implement this, we need to filter out out system abbrevs before
                                       ^^^^^^^
A typo.

Thanks.