bug check/user rank

go/gopath/src/fohow.com/apps/controllers/user_controller/user_controller.go

@@ -84,7 +84,9 @@ func (self *UserController) CheckLogin() {
 	if merchantUser != nil {
 		userInfo.MerchantId = merchantUser.MerchantId
 	}
-	userInfo.Rank = wxUser.Rank
+	if wxUser != nil {
+		userInfo.Rank = wxUser.Rank
+	}
 	self.Data["json"] = userInfo
 	self.ServeJSON()
 }