I just fixed a regression in KIO-5.80.0 which made e.g. kmail crash when opening an attachment
with no known application for its mimetype (and therefore the open with dialog is supposed
to show up).

The updated tarball is up at the usual place.

kio v5.80.1
45466ca75db1d7c981130bd3b2c78c41d7d7eccf
d971ce61a022f9e4d2d6be9c66917be271d0fb212795a151150e208e64cd5a28  sources/kio-5.80.1.tar.xz

-- 
David Faure, faure@kde.org, http://www.davidfaure.fr
Working on KDE Frameworks 5