- close SceneViewer when scene is closed

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7103 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

sdk/jme3-core/src/com/jme3/gde/core/scene/SceneApplication.java

@@ -421,6 +421,7 @@ public class SceneApplication extends Application implements LookupProvider, Loo
             public void run() {
                 if (node == null) {
                     SceneViewerTopComponent.findInstance().setActivatedNodes(new org.openide.nodes.Node[]{});
+                    SceneViewerTopComponent.findInstance().close();
                 } else {
                     SceneViewerTopComponent.findInstance().setActivatedNodes(new org.openide.nodes.Node[]{node});
                     SceneViewerTopComponent.findInstance().open();