Gwenview-importer, fix for data loss (post-17.04.2)

[Luigi Toscano]

Hi,

the Gwenview importer up to 17.04.2 has few bugs which can easily lead to data
loss. See https://bugs.kde.org/show_bug.cgi?id=379615 for more details.

The reporter (Henrik Fehlauer, in CC if you have questions) kindly provided a
patch but it landed into Applications/17.04 only after the tagging of 17.04.2.

I'd strongly suggest to pick this commit in your packages (it will be in
17.04.3, with few additional tests in the next commits):
https://commits.kde.org/gwenview/6ce5d2f8d82f83c5a3d726ee5807ebaf7a6e3c6c

Ciao
-- 
Luigi