fix(service,achievement) : prevent error when fetching product user ID prematurely

Author: arthur740212

Assets/Scripts/StandardSamples/Services/AchievementsService.cs

@@ -128,6 +128,10 @@ protected override void OnLoggedOut()
         /// </summary>
         protected async override Task InternalRefreshAsync()
         {
+            if (!TryGetProductUserId(out ProductUserId productUser)) 
+            {
+                return;
+            }
             ProductUserId productUserId = EOSManager.Instance.GetProductUserId();
             _achievements = await QueryAchievementsAsync(productUserId);