Michael Albinus <michael.albinus@gmx.de> writes:

> Couldn't we simply fix this in 'debbugs-gnu-sort-submitter' and
> 'debbugs-gnu-sort-title'? That is, handling a nil value for submitter
> and title?
>
> And do you have an example bug number where this could happen?

You are correct.  I have no example and I doubt such a bug exists.  We
could remove that part of this patch.  Although it is odd that the
DEFAULT argument to alist-get is set in that case.

On a related note, bug#60850 does not have a subject line so here is
more complete patch: