From 904c4e57935d22690a8c63c424fef8c0df08223a Mon Sep 17 00:00:00 2001
From: Alexandre Chopin <wikeo65@gmail.com>
Date: Tue, 20 Dec 2016 17:30:43 +0100
Subject: [PATCH] add optional param by default

---
 lib/build/index.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/build/index.js b/lib/build/index.js
index e81f968a2e..80cb7c37d0 100644
--- a/lib/build/index.js
+++ b/lib/build/index.js
@@ -229,8 +229,15 @@ function createRoutes (files, srcDir) {
 }
 
 function cleanChildrenRoutes (routes, isChild = false) {
+  let isOptional = true
   routes.forEach((route) => {
     route.path = (isChild) ? route.path.replace('/', '') : route.path
+    if (route.path === '') {
+      isOptional = false
+    }
+    if (isChild && isOptional && route.path.includes(':')) {
+      route.path += '?'
+    }
     if (route.children) {
       delete route.name
       route.children = cleanChildrenRoutes(route.children, true)