Correct NullReferenceException when From address not explicitly set

[tigreye007]

Workaround: set the from address explicitly from the web.config on controller initialize:

    protected override void Initialize(System.Web.Routing.RequestContext requestContext)
    {
        base.Initialize(requestContext);

        var section = ConfigurationManager.GetSection("system.net/mailSettings/smtp") as SmtpSection;
        MailAttributes.From = new System.Net.Mail.MailAddress(section.From);
    }

[Eonasdan]

this has been fixed in PR #23