From ee02d2fc00a110926e655460a94c344d45ad19e1 Mon Sep 17 00:00:00 2001
From: sang <days_v@qq.com>
Date: Tue, 15 Mar 2016 16:16:54 +0800
Subject: [PATCH] fix 'TypeError: callback is not a function'

---
 lib/empty/index.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/empty/index.js b/lib/empty/index.js
index 23172bdc..a17cbae1 100644
--- a/lib/empty/index.js
+++ b/lib/empty/index.js
@@ -4,6 +4,7 @@ var mkdir = require('../mkdirs')
 var remove = require('../remove')
 
 function emptyDir (dir, callback) {
+  callback = callback || function () {}
   fs.readdir(dir, function (err, items) {
     if (err) return mkdir.mkdirs(dir, callback)