Added check for null
Added check for null

tomasthoresen/osg,openscenegraph/osg,scrawl/osg,jtorresfabra/osg,marchelbling/osg,tomasthoresen/osg,jtorresfabra/osg,openscenegraph/osg,marchelbling/osg,scrawl/osg,tomasthoresen/osg,marchelbling/osg,tomasthoresen/osg,openscenegraph/osg,jtorresfabra/osg,openscenegraph/osg,jtorresfabra/osg,scrawl/osg,marchelbling/osg,scrawl/osg