Update to 3.5.2 and .net core 2.1

MediaBrowser.Api/UserLibrary/GameGenresService.cs

@@ -31,7 +31,7 @@ namespace MediaBrowser.Api.UserLibrary
         /// </summary>
         /// <value>The user id.</value>
         [ApiMember(Name = "UserId", Description = "Optional. Filter by user id, and attach user data", IsRequired = false, DataType = "string", ParameterType = "query", Verb = "GET")]
-        public string UserId { get; set; }
+        public Guid UserId { get; set; }
     }
 
     [Authenticated]
@@ -46,7 +46,7 @@ namespace MediaBrowser.Api.UserLibrary
         {
             var result = GetItem(request);
 
-            return ToOptimizedSerializedResultUsingCache(result);
+            return ToOptimizedResult(result);
         }
 
         /// <summary>
@@ -60,7 +60,7 @@ namespace MediaBrowser.Api.UserLibrary
 
             var item = GetGameGenre(request.Name, LibraryManager, dtoOptions);
 
-            if (!string.IsNullOrWhiteSpace(request.UserId))
+            if (!request.UserId.Equals(Guid.Empty))
             {
                 var user = UserManager.GetUserById(request.UserId);
 
@@ -79,7 +79,7 @@ namespace MediaBrowser.Api.UserLibrary
         {
             var result = GetResultSlim(request);
 
-            return ToOptimizedSerializedResultUsingCache(result);
+            return ToOptimizedResult(result);
         }
 
         protected override QueryResult<Tuple<BaseItem, ItemCounts>> GetItems(GetItemsByName request, InternalItemsQuery query)