* Throw proper exception in TestJoystick if none found

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7440 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/test/jme3test/input/TestJoystick.java

@@ -21,6 +21,9 @@ public class TestJoystick extends SimpleApplication implements AnalogListener {
     @Override
     public void simpleInitApp() {
         Joystick[] joysticks = inputManager.getJoysticks();
+        if (joysticks == null)
+            throw new IllegalStateException("Cannot find any joysticks!");
+            
         for (Joystick joy : joysticks){
             System.out.println(joy.toString());
         }