From 61b38571343d1751bfe552f60cec7429911e295c Mon Sep 17 00:00:00 2001
From: kimth <kimth@edx.org>
Date: Wed, 10 Oct 2012 03:46:17 +0000
Subject: [PATCH] Don't function call on null

---
 common/lib/xmodule/xmodule/js/src/javascript_loader.coffee | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/lib/xmodule/xmodule/js/src/javascript_loader.coffee b/common/lib/xmodule/xmodule/js/src/javascript_loader.coffee
index 543aec8edc..c3f536787e 100644
--- a/common/lib/xmodule/xmodule/js/src/javascript_loader.coffee
+++ b/common/lib/xmodule/xmodule/js/src/javascript_loader.coffee
@@ -15,7 +15,7 @@ class @JavascriptLoader
     placeholders = el.find(".script_placeholder")
 
     if placeholders.length == 0
-      callback()
+      callback() if callback?
       return
 
     # TODO: Verify the execution order of multiple placeholders