### Bug report
When the project is configured for runtime compilation, and the TagHelper DropDownList has custom classes or attributes, NullReferenceException is thrown.
### Reproduction of the problem
1. Create a .NET 8 project and install the Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation NuGet package.
2. Define a TagHelper DropDownList and add a custom class:
//Program.cs
builder.Services.AddControllersWithViews().AddRazorRuntimeCompilation();
builder.Services.AddMvc().AddJsonOptions(options => options.JsonSerializerOptions.PropertyNamingPolicy = null);
builder.Services.AddKendo();
//View
<kendo-dropdownlist for="Id" datatextfield="Text" datavaluefield="Value" auto-width="true" class="form-control w-75">
<datasource type="Kendo.Mvc.UI.DataSourceTagHelperType.Ajax">
<transport>
<read url="@Url.Action("GetData", "Home")"/>
</transport>
</datasource>
</kendo-dropdownlist>3. Run the application and observe the exception: "NullReferenceException: Object reference not set to an instance of an object."
4. When using the HtmlHelper version of the DropDownList or removing the custom class from the TagHelper declaration, the error does not occur.
### Expected/desired behavior
The TagHelper DropDownList must exhibit the same behavior as the HtmlHelper DropDownList.
### Workaround
Add the custom class with jQuery:
<kendo-dropdownlist for="Id" datatextfield="Name" datavaluefield="Id" auto-width="true">
...
</kendo-dropdownlist>
<script>
$(document).ready(function(){
$("#Id").addClass("form-control w-75"); // add the class to the hidden input element
$("#Id").attr("required", "required");
$("#Id").closest("span.k-dropdownlist").addClass("form-control w-75"); // add the class to the wrapper element
});
</script>Alternatively, switch to the HtmlHelper version of the DropDownList.
### Environment
* **Telerik UI for ASP.NET Core version: 2024.4.1112
* **Browser: [all]
