D16744: Fix crash if XDG_CACHE_HOME directory is too small or out of space

[Alexey Min]

alexeymin added a reviewer: Frameworks.

REPOSITORY
  R244 KCoreAddons

REVISION DETAIL
  https://phabricator.kde.org/D16744

To: alexeymin, dfaure, #frameworks
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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