Ignore null json values

Emby.Server.Implementations/Data/SqliteItemRepository.cs

@@ -90,6 +90,9 @@ namespace Emby.Server.Implementations.Data
             _typeMapper = new TypeMapper();
             _jsonOptions = JsonDefaults.GetOptions();
 
+            // GetItem throws NotSupportedException with this enabled, so hardcode false.
+            _jsonOptions.IgnoreNullValues = false;
+
             DbFilePath = Path.Combine(_config.ApplicationPaths.DataPath, "library.db");
         }