Added if (!null) guard around description strings.
Added if (!null) guard around description strings.


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