unpublish method
Implementation
void unpublish(UBlogResponse i) => UServices.blog.unpublish(
p: UIdParams(id: i.id),
onOk: (UEmptyResponse r) => okCallback(r.message, read),
onError: (UEmptyResponse r) => errorCallBack(r.message, read),
onException: (String e) => errorCallBack(U.s.errorSubmittingForm, read),
);