From fc94383487f90099b6dd452ff8e52cd9859c6002 Mon Sep 17 00:00:00 2001
From: Jason Grout <jgrout6@bloomberg.net>
Date: Fri, 31 Oct 2014 22:45:06 +0000
Subject: [PATCH] Better error messages with correct stack traces

---
 IPython/html/static/base/js/utils.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/IPython/html/static/base/js/utils.js b/IPython/html/static/base/js/utils.js
index ff9febf9c..b6cc19411 100644
--- a/IPython/html/static/base/js/utils.js
+++ b/IPython/html/static/base/js/utils.js
@@ -618,7 +618,8 @@ define([
             if (module_name) {
                 require([module_name], function(module) {
                     if (module[class_name] === undefined) {
-                        reject(new Error('Class not found in module.'));
+                        console.error('Class '+class_name+' not found in module '+module_name)
+                        reject();
                     } else {
                         resolve(module[class_name]);
                     }
@@ -627,7 +628,8 @@ define([
                 if (registry && registry[class_name]) {
                     resolve(registry[class_name]);
                 } else {
-                    reject(new Error('Class not found in registry.'));
+                    console.error('Class '+class_name+' not found in registry ', registry);
+                    reject();
                 }
             }
         });