made final callback optional in during and doDuring

1 files changed, 3 insertions, 1 deletions

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);
         });
     };