From e3f2eb8452e66747873ac0896cf8f50b270bbd41 Mon Sep 17 00:00:00 2001
From: MinRK <benjaminrk@gmail.com>
Date: Wed, 18 Sep 2013 23:12:06 -0700
Subject: [PATCH] no highlight if no language specified

---
 IPython/html/static/notebook/js/main.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/IPython/html/static/notebook/js/main.js b/IPython/html/static/notebook/js/main.js
index 4f3b72b44..ec25f2342 100644
--- a/IPython/html/static/notebook/js/main.js
+++ b/IPython/html/static/notebook/js/main.js
@@ -99,6 +99,10 @@ function (marked) {
             tables: true,
             langPrefix: "language-",
             highlight: function(code, lang) {
+                if (!lang) {
+                    // no language, no highlight
+                    return code;
+                }
                 var highlighted;
                 try {
                     highlighted = hljs.highlight(lang, code, false);