D17828: Don't check twice if the icon exists from ::availableSizes

[Christoph Feck]

cfeck accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R302 KIconThemes

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17828

To: apol, #frameworks, cfeck
Cc: kde-frameworks-devel, michaelh, ngraham, bruns