From 39cb52fb197f631b401a4a93bed5830b98f017b4 Mon Sep 17 00:00:00 2001
From: Alexander Early <alexander.early@gmail.com>
Date: Sun, 28 Jun 2015 15:37:41 -0700
Subject: made final callback optional in during and doDuring

---
 lib/async.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/async.js b/lib/async.js
index 7154ca2..abddcd9 100644
--- a/lib/async.js
+++ b/lib/async.js
@@ -847,6 +847,7 @@
     };
 
     async.during = function (test, iterator, callback) {
+        callback = callback || noop;
         test(function(err, truth) {
             if (err) {
                 return callback(err);
@@ -866,6 +867,7 @@
     };
 
     async.doDuring = function (iterator, test, callback) {
+        callback = callback || noop;
         iterator(function (err) {
             if (err) {
                 return callback(err);
@@ -882,7 +884,7 @@
                     callback(null);
                 }
             });
-            test.apply(null, args); 
+            test.apply(null, args);
         });
     };
 
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