RemoveEmptyNodesVisitor: add missing isOperationPermissible check
RemoveEmptyNodesVisitor: add missing isOperationPermissible check

scrawl/osg,openscenegraph/osg,openscenegraph/osg,jtorresfabra/osg,scrawl/osg,scrawl/osg,scrawl/osg,openscenegraph/osg,openscenegraph/osg,jtorresfabra/osg,jtorresfabra/osg,jtorresfabra/osg