修复steam库存游戏在steam账号切换后自动刷新失败的问题

修复steam库存游戏编辑带有本地化名称的游戏无效的问题

src/ST.Client.Desktop.Windows/Services/Implementation/SteamServiceImpl.cs

@@ -847,6 +847,7 @@ namespace System.Application.Services.Implementation
 
         static uint GetUInt32(dynamic value)
         {
+            if (value is null) return 0;
             if (value is VValue vvalue) return GetUInt32(vvalue.Value!);
             if (value is uint value2) return value2;
             if (value is IConvertible convertible)