fix NPE in AndroidHarness when quitting (thanks iwgEric)

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9241 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/android/com/jme3/app/AndroidHarness.java

@@ -230,6 +230,7 @@ public class AndroidHarness extends Activity implements TouchListener, DialogInt
             view.onResume();
         }
 
+        if (app != null) {
             //resume the audio
             AudioRenderer result = app.getAudioRenderer();
             if (result != null) {
@@ -238,6 +239,7 @@ public class AndroidHarness extends Activity implements TouchListener, DialogInt
                     renderer.resumeAll();
                 }
             }
+        }
 
         isGLThreadPaused = false;
         logger.info("onResume");
@@ -250,6 +252,7 @@ public class AndroidHarness extends Activity implements TouchListener, DialogInt
             view.onPause();
         }
 
+        if (app != null) {
             //pause the audio
             AudioRenderer result = app.getAudioRenderer();
             if (result != null) {
@@ -259,9 +262,10 @@ public class AndroidHarness extends Activity implements TouchListener, DialogInt
                     renderer.pauseAll();
                 }
             }
-
+        }
         isGLThreadPaused = true;
         logger.info("onPause");
+
     }
 
     @Override