Hi, there is an issue with EnumSelect after improvements of Version 0.19.0

If I use a nullable Enum as the bound value, e. g.:

<EnumSelect TEnum="Visibility?" Placeholder="Please select visibility" @bind-Value="@model.VisibilityNullable" />

@code {
  private Model model = new();
  public enum Visibility
  {
      Private,
      Public
  }
  
  public class Model
  {
      public Visibility? VisibilityNullable { get; set; }
  }
}

an exception is thrown while initialize/render:

The type initializer for 'AntDesign.EnumHelper1' threw an exception. ---> System.ArgumentException: Method 'Boolean HasFlag(System.Enum)' declared on type 'System.Enum' cannot be called with instance of type 'System.Nullable1[antdesigntest.Models.Visibility]'