kopete occasionally exits when closing a chat window

[Reindl Harald]

https://bugs.kde.org/show_bug.cgi?id=75805
looks like that came back

it's at least not kopete-15.08.2-1.fc23.x86_64 (found on koji now, no 
idea why it's not in the reoos) but some of the other recent updates - 
well, i did no texpect that i have to test open and close a chat window 
when kopete itself was not updated