JITL MailJob does not add attachment file(s)

Current Situation

• The JITL com.sos.jitl.jobs.mail.MailJob template can be used to send mail by a job from an Agent.
• One or more attachments can be specified with the attachment argument.
  • this does not work - the attachment argument is ignored an the mail has no attachments

Desired Behavior

• Sending attachments should work