fix error handling in guest-wcf dialog
fix error handling in guest-wcf dialog

Is currently writing as a guest a response to a comment and choose for example an blocked name, the dialog is closed anyway, instead of displaying the error message.
Cyperghost/WCF,0xLeon/WCF,Cyperghost/WCF,NBZ4live/WCF,SoftCreatR/WCF,Cyperghost/WCF,MeinAccount/WCF,ramiusGitHub/WCF,ramiusGitHub/WCF,SoftCreatR/WCF,MeinAccount/WCF,cashcat/WCF-1,WoltLab/WCF,Morik/WCF,MenesesEvandro/WCF,WoltLab/WCF,0xLeon/WCF,0xLeon/WCF,SoftCreatR/WCF,SoftCreatR/WCF,Morik/WCF,WoltLab/WCF,Morik/WCF,Cyperghost/WCF,WoltLab/WCF,joshuaruesweg/WCF,cashcat/WCF-1,NBZ4live/WCF,Cyperghost/WCF,joshuaruesweg/WCF,joshuaruesweg/WCF,MenesesEvandro/WCF,Morik/WCF