Add ACL
Created by: rjw57
https://dashboard.jwplayer.com/#/content/detail?key=2DmIJaCK&view=list&spotlight=default&property=97da86aa-5780-11e7-9389-0637bffb81a3 has the ACL "['']" and https://dashboard.jwplayer.com/#/content/detail?key=FwxFJv8b&view=list&spotlight=default&property=97da86aa-5780-11e7-9389-0637bffb81a3 has the ACL "" which breaks current ACL processing.