Fix highlighter selection of MESSAGE_PUBLIC_HIGHLIGHTERS is empty
Fix highlighter selection of MESSAGE_PUBLIC_HIGHLIGHTERS is empty

see #2752

SoftCreatR/WCF,Cyperghost/WCF,WoltLab/WCF,SoftCreatR/WCF,WoltLab/WCF,Cyperghost/WCF,Cyperghost/WCF,MenesesEvandro/WCF,Cyperghost/WCF,SoftCreatR/WCF,WoltLab/WCF,Cyperghost/WCF,SoftCreatR/WCF,MenesesEvandro/WCF,WoltLab/WCF