Fixed an NPE in the FlyCamAppState that occurred

when shutting down an app with no InputManager.


git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10945 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/app/FlyCamAppState.java

@@ -87,7 +87,9 @@ public class FlyCamAppState extends AbstractAppState {
     public void cleanup() {
         super.cleanup();
 
-        flyCam.unregisterInput();        
+        if (app.getInputManager() != null) {        
+            flyCam.unregisterInput();
+        }        
     }