SDK:

- Fix bug in physics stop button

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8604 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

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

@@ -584,6 +584,7 @@ public class SceneApplication extends Application implements LookupProvider, Loo
                     if (physicsState != null) {
                         physicsState.getPhysicsSpace().removeAll(rootNode);
                         getStateManager().detach(physicsState);
+                        physicsState = null;
                     }
                 }
                 return null;