Fixed JavaScript error during uninstallation
Fixed JavaScript error during uninstallation

Fixes #842

joshuaruesweg/WCF,SoftCreatR/WCF,PhrozenByte/WCF2,Morik/WCF,Cyperghost/WCF,ramiusGitHub/WCF,WoltLab/WCF,0xLeon/WCF,SoftCreatR/WCF,Cyperghost/WCF,NBZ4live/WCF,cashcat/WCF-1,joshuaruesweg/WCF,Cyperghost/WCF,MenesesEvandro/WCF,WoltLab/WCF,SoftCreatR/WCF,SoftCreatR/WCF,Cyperghost/WCF,0xLeon/WCF,Cyperghost/WCF,Morik/WCF,Morik/WCF,WoltLab/WCF,0xLeon/WCF,MeinAccount/WCF,ramiusGitHub/WCF,Morik/WCF,joshuaruesweg/WCF,cashcat/WCF-1,PhrozenByte/WCF2,NBZ4live/WCF,MenesesEvandro/WCF,WoltLab/WCF,MeinAccount/WCF