fix problem on MacOS X where externally specified icons caused a crash. This fixes the bug reported by Christian in: http://root.cern.ch/phpBB2/viewtopic.php?t=2159
fix problem on MacOS X where externally specified icons caused a crash.
This fixes the bug reported by Christian in:
http://root.cern.ch/phpBB2/viewtopic.php?t=2159


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@12204 27541ba8-7e3a-0410-8455-c3a389f83636

dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT