- return null for OptimizeGeometry (no undo atm)

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7116 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

jme3-core/src/com/jme3/gde/core/sceneexplorer/nodes/actions/impl/OptimizeGeometry.java

@@ -53,7 +53,7 @@ public class OptimizeGeometry extends AbstractToolAction {
     protected Object doApplyTool(AbstractSceneExplorerNode rootNode) {
         Spatial geom = rootNode.getLookup().lookup(Spatial.class);
         GeometryBatchFactory.optimize(geom);
-        return true;
+        return null;
     }
 
     @Override