Update SendGridMessage.cs

[JefStat]

Personalization Tos field can be null

Snippet of the code that was throwing a null pointer exception

var msg = new SendGridMessage();
var i = 0;
        to.ForEach(o =>
        {
             if (o.Substitutions!= null && o.Substitutions.Any())
                {
                    p = new Personalization
                    {
                        Tos = new List<EmailAddress>(), //added to fix null pointer exception in sendgrid lib
                        Substitutions = new Dictionary<string, string>(o.Substitutions)
                    };
                }
                var newTemplateId = o.Metadata.ContainsKey("templateId")
                    ? o.Metadata["templateId"]?.ToString()
                    : null;
                msg.TemplateId = newTemplateId ?? msg.TemplateId;
                msg.AddTo(new EmailAddress(o.To),i,p);

[SendGridDX]

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[thinkingserious]

Thanks @JefStat,

Do you mind adding the same checks for AddBcc, AddCc while the hood is up? :)

[thinkingserious]

Hello @JefStat,

Thanks again for the PR!

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