Update non-user email addresses attached to a ticket's email notify list.
Creates new additional emails for assigned user if new emails are provided. Attaches any newly created additional emails to ticket. Remove any additional emails from a ticket that are not provided as part of $emails
|emails||array of strings||A list of email addresses to notify when a ticket is updated|
Throw the exception “This ticket does not have an assigned user. Could not add additional emails.” if the given ticket is not assigned to a user.