Resolve "ViewHighScoreState"

Closes #33 (closed)

frontend/core/src/com/gameware/game/states/MenuState.java

@@ -75,7 +75,13 @@ public class MenuState extends State{
         TextButton highScoreBtn = new TextButton(highScoreBtnText, skin);
         highScoreBtn.addListener(new ClickListener() {
             @Override
-            public void clicked(InputEvent e, float x, float y){ handleHighscoreBtnClick(); }
+            public void clicked(InputEvent e, float x, float y){
+                try {
+                    handleHighscoreBtnClick();
+                } catch (IOException ex) {
+                    ex.printStackTrace();
+                }
+            }
         });
         return highScoreBtn;
     }
@@ -131,7 +137,7 @@ public class MenuState extends State{
         gsm.set(new SinglePlayerSelectGameState(gsm));
     }
 
-    private void handleHighscoreBtnClick(){
+    private void handleHighscoreBtnClick() throws IOException {
         gsm.set(new ViewHighScoreState(gsm));
     }