Do nothing

android/java/app/src/main/java/com/mapbox/mapboxgl/app/MainActivity.java

@@ -156,6 +156,10 @@ public class MainActivity extends ActionBarActivity {
                 case 6:
                     mMapFragment.getMap().setStyleUrl("asset://styles/styles/empty-v6.json");
                     break;
+
+                default:
+                    onNothingSelected(parent);
+                    break;
             }
         }