#19 Fix pausing app while application scope assets loading

core/src/cz/nic/tablexia/Tablexia.java

@@ -119,8 +119,10 @@ public class Tablexia extends TablexiaApplication {
     @Override
     public void pause() {
         super.pause();
-        // don't use menu open animation for android pause event (animation is run after resume on android)
-        mainMenuContainer.openMainMenu(!Gdx.app.getType().equals(Application.ApplicationType.Android));
+        if (mainMenuContainer != null) {
+            // don't use menu open animation for android pause event (animation is run after resume on android)
+            mainMenuContainer.openMainMenu(!Gdx.app.getType().equals(Application.ApplicationType.Android));
+        }
     }
 
     @Override