Catch json error on update
Catch json error on update

might fix #184

wangjun/goread,elancom/goread,beni55/goread,mikecb/goread,lnmx/goread,mjibson/goread,youprofit/goread,youprofit/goread,beni55/goread,mgaitan/goread,Feitianyuan/goread,elancom/goread,doublehou/goread,mgaitan/goread,mikecb/goread,beni55/goread,mjibson/goread,elancom/goread,lnmx/goread,Feitianyuan/goread,doublehou/goread,doublehou/goread,wangjun/goread,mjibson/goread,wangjun/goread,P7h/goread,Feitianyuan/goread,mgaitan/goread,mikecb/goread,youprofit/goread,P7h/goread,lnmx/goread,P7h/goread