D5506: Don't even try to create icons with empty sizes

[Aleix Pol Gonzalez]

apol created this revision.
Restricted Application added a project: Frameworks.

REVISION SUMMARY
  It's not enough to have QSize::isValid, as it needs both width and height
  to be 0, so we explicitly check it.
  Fixes a warning about writing into an empty image.

REPOSITORY
  R302 KIconThemes

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5506

AFFECTED FILES
  src/kiconengine.cpp

To: apol, #frameworks
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