D21236: Fix crashes with Qt 5.12

[Wolfgang Bauer]

wbauer added a reviewer: KDE PIM.

REPOSITORY
  R201 Akregator

REVISION DETAIL
  https://phabricator.kde.org/D21236

To: wbauer, #kde_pim
Cc: mlaurent, kde-pim, amantia, dvasin, rodsevich, winterz, vkrause, knauss, dvratil
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