- avoid null node names in obj importer

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10362 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core-plugins/com/jme3/scene/plugins/OBJLoader.java

@@ -139,7 +139,9 @@ public final class OBJLoader implements AssetLoader {
         
         public Spatial createGeometry(){
             Node groupNode = new Node(objectName);
-            
+            if (objectName == null) {
+                groupNode.setName("Model");
+            }
 //            if (matFaces.size() > 0){
 //                for (Entry<String, ArrayList<Face>> entry : matFaces.entrySet()){
 //                    ArrayList<Face> materialFaces = entry.getValue();