Ensure author-link key has a value in Worker\Notifier
Ensure author-link key has a value in Worker\Notifier

- Address https://github.com/friendica/friendica/issues/8875#issuecomment-691942457

fabrixxm/friendica,annando/friendica,fabrixxm/friendica,friendica/friendica,fabrixxm/friendica,tobiasd/friendica,tobiasd/friendica,fabrixxm/friendica,friendica/friendica,annando/friendica,friendica/friendica,friendica/friendica,fabrixxm/friendica,annando/friendica,tobiasd/friendica,friendica/friendica,tobiasd/friendica,annando/friendica,tobiasd/friendica,annando/friendica