Added Node::getName() and getUserDataContainer() to check to see if an node can be removed or not.

src/osgUtil/Optimizer.cpp

@@ -1410,11 +1410,11 @@ bool Optimizer::RemoveRedundantNodesVisitor::isOperationPermissible(osg::Node& n
 {
     return node.getNumParents()>0 &&
            !node.getStateSet() &&
-           !node.getUserData() &&
+           node.getName().empty() &&
+           !node.getUserDataContainer() &&
            !node.getCullCallback() &&
            !node.getEventCallback() &&
            !node.getUpdateCallback() &&
-           node.getDescriptions().empty() &&
            isOperationPermissibleForObject(&node);
 }