fix 10.7.2 nullable

Jellyfin.Data/Entities/CustomItemDisplayPreferences.cs

@@ -17,7 +17,7 @@ namespace Jellyfin.Data.Entities
         /// <param name="client">The client.</param>
         /// <param name="preferenceKey">The preference key.</param>
         /// <param name="preferenceValue">The preference value.</param>
-        public CustomItemDisplayPreferences(Guid userId, Guid itemId, string client, string preferenceKey, string? preferenceValue)
+        public CustomItemDisplayPreferences(Guid userId, Guid itemId, string client, string preferenceKey, string preferenceValue)
         {
             UserId = userId;
             ItemId = itemId;
@@ -85,6 +85,6 @@ namespace Jellyfin.Data.Entities
         /// Required.
         /// </remarks>
         [Required]
-        public string? Value { get; set; }
+        public string Value { get; set; }
     }
 }

Jellyfin.Server.Implementations/Users/DisplayPreferencesManager.cs

@@ -67,7 +67,7 @@ namespace Jellyfin.Server.Implementations.Users
         }
 
         /// <inheritdoc />
-        public Dictionary<string, string?> ListCustomItemDisplayPreferences(Guid userId, Guid itemId, string client)
+        public Dictionary<string, string> ListCustomItemDisplayPreferences(Guid userId, Guid itemId, string client)
         {
             return _dbContext.CustomItemDisplayPreferences
                 .AsQueryable()