Added handling of NULL
Added handling of NULL

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