Fix unknow error when dos-protection is enabled for the first time
Fix unknow error when dos-protection is enabled for the first time

biddyweb/flexisip,gale320/flexisip,BelledonneCommunications/flexisip,BelledonneCommunications/flexisip,gale320/flexisip,biddyweb/flexisip,biddyweb/flexisip,gale320/flexisip,gale320/flexisip,BelledonneCommunications/flexisip,BelledonneCommunications/flexisip,biddyweb/flexisip