Return early if link is missing from share block in Model\Item
Return early if link is missing from share block in Model\Item

- Address https://github.com/friendica/friendica/issues/7998#issuecomment-594992869

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