NullReferenceException if using FindControl on a form having control w/o name attribute set

[fehdem]

I used this little piece of code to get access to an TextInputControl on a form.

using (var browser = new MechanizeBrowser())
{
  var page = await browser.NavigateAsync("https://<blabla>");
  if (page.IsHtml)
  {
    var form = page.Forms["login"];
    var queryfield = form.FindControl<TextInputControl>("param3");
    ....
  }
}

The login form contains some controls, some w/o having the name attribute set. This results in a NullReferenceException when calling form.FindControl.
I cloned the repro locally and found the issue in HtmlForm.cs.

public T FindControl<T>(string Name) where T : HtmlFormControl
{
  return (T)this.FirstOrDefault(item => item.Name != null && item.Name.Equals(Name,StringComparison.OrdinalIgnoreCase));
}

The code on Master lacks a check whether item.Name is set to any string. I added a null check as a bugfix. If I don't miss any side effect you may include this into your master as well.

Best regards,
Marcus