bug#40290: 26.3; Fix displaying inline ical attachments with no charset

[Lars Ingebrigtsen]

Christophe Troestler <Christophe.Troestler@umons.ac.be> writes:

> When an inline ical attachment contains no charset (this is the case
> when one attaches an .ics file with message mode),
> `gnus-article-prepare-display' fails.  The problem is in
> `gnus-icalendar-with-decoded-handle' which tries to downcase nil.
>
> The attached patch fixes this.

Thanks; I've applied it to Emacs 28.

This is the third small patch from you in Emacs, so you're reaching the
limit for the number of changed lines we can apply without getting an
FSF copyright assignment.  Would you be willing to sign such papers?
Then the next patch you send won't have to wait for the paperwork to be
done.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no