No message when no auto response destination.

When notication is disable by NoAutoRegExp for example
@AutoReplyAddresses can be empty. No message will be sent but an article
will be create.

HereAutoReplyAddresses is test for empty value before sending email
preventing any new article to be created when no AutoReplyAddresses
exist.

May be this feature should be done in ArticleSend. I don't know.

Thank you very much for the great work you make on OTRS.