From f0cb45536c2e25eee6f9504603823c0d99a503e3 Mon Sep 17 00:00:00 2001
From: Stefan Karpinski <stefan@karpinski.org>
Date: Wed, 24 Jul 2013 21:03:57 -0700
Subject: [PATCH] handle empty metadata in pyout messages more gracefully.

---
 IPython/html/static/notebook/js/outputarea.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/IPython/html/static/notebook/js/outputarea.js b/IPython/html/static/notebook/js/outputarea.js
index 8d14a751c..5ed815229 100644
--- a/IPython/html/static/notebook/js/outputarea.js
+++ b/IPython/html/static/notebook/js/outputarea.js
@@ -255,6 +255,9 @@ var IPython = (function (IPython) {
 
 
     OutputArea.prototype.convert_mime_types = function (json, data) {
+        if (data === undefined) {
+            return json;
+        }
         if (data['text/plain'] !== undefined) {
             json.text = data['text/plain'];
         }