Fix for kontact crash on logout

[David Faure]

Dear packagers,

I just fixed kontact crashing on every logout

https://commits.kde.org/kmail/97e165dcf5a851ee10526631d24f9af7736da2e6

You might want to integrate this into your 19.04.2 packages.
It's of course only an annoyance since the user is not doing any work at that 
point and can just dismiss drkonqi in order to be able to go home, but it 
reflects badly on the perceived quality ;-)

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