Fix PHP 7.2 compatibility of amp article template
Fix PHP 7.2 compatibility of amp article template

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