Not sending notification when multiple recipients specified in settings

[chadcrowell]

With 1 email address in the settings, the notifications send. With more than 1, comma separated, the queue job fails. I have tried multiple combinations of email addresses and it keeps failing.

Adding

if(!is_array($recipient)) {
            $recipient = explode(',',$recipient);
        }

before $mail = new Message(); in the sendMail service fixed the issue.