Only switch to main screen when player id is fetched

Added a error handler to fetching player id

Change-Id: Id3f46e3237b4530b0b1d6498f095119da4f36d78

Author: mwgray

ButtonClicker/src/main/java/com/google/example/games/bc/MainActivity.java

@@ -631,16 +631,16 @@ private void onConnected(GoogleSignInAccount googleSignInAccount) {
 
       // get the playerId from the PlayersClient
       PlayersClient playersClient = Games.getPlayersClient(this, googleSignInAccount);
-      playersClient.getCurrentPlayer().addOnSuccessListener(
-          new OnSuccessListener<Player>() {
+      playersClient.getCurrentPlayer()
+          .addOnSuccessListener(new OnSuccessListener<Player>() {
             @Override
             public void onSuccess(Player player) {
               mPlayerId = player.getPlayerId();
-            }
-          }
-      );
 
-      switchToMainScreen();
+              switchToMainScreen();
+            }
+          })
+          .addOnFailureListener(createFailureListener("There was a problem getting the player id!"));
     }
 
     // register listener so we are notified if we receive an invitation to play