From 0ac70766eb41a45a6210f00135aaac34e71794d4 Mon Sep 17 00:00:00 2001
From: Clark Wang <clark.wangs@gmail.com>
Date: Tue, 24 Nov 2015 17:15:53 +0800
Subject: [PATCH] silence a warning that introduced in bluebird 3.0

see http://bluebirdjs.com/docs/warning-explanations.html#warning-a-promise-was-created-in-a-handler-but-none-were-returned-from-it

Signed-off-by: Clark Wang <clark.wangs@gmail.com>
---
 lib/observer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/observer.js b/lib/observer.js
index 57e3ed58..fcbabf26 100644
--- a/lib/observer.js
+++ b/lib/observer.js
@@ -98,7 +98,7 @@ ObserverMixin.notifyObserversOf = function(operation, context, callback) {
         var retval = fn(context, next);
         if (retval && typeof retval.then === 'function') {
           retval.then(
-            function() { next(); },
+            function() { next(); return null; },
             next // error handler
           );
         }