Added handling of null dynamic_cast<>
Added handling of null dynamic_cast<>

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