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

[Christoph Feck]

cfeck added a reviewer: mpyne.
cfeck added a comment.


  Would a switch be more readable?

REPOSITORY
  R244 KCoreAddons

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

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