Fix condition in dfrn_request_content() when $a->profile isn't set
Fix condition in dfrn_request_content() when $a->profile isn't set

See https://github.com/friendica/friendica/issues/6917#issuecomment-494087890

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