From a007bcdfea8d22b2291cf62781ebe959445ea5a1 Mon Sep 17 00:00:00 2001
From: Jacob MacDonald <jakemac@google.com>
Date: Wed, 1 Oct 2014 09:05:05 -0700
Subject: [PATCH] Wrap the document, and handle null

---
 src/Observer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Observer.js b/src/Observer.js
index 232354a..e8cbf28 100644
--- a/src/Observer.js
+++ b/src/Observer.js
@@ -293,7 +293,7 @@ function handler(mutations) {
 
 function takeRecords(node) {
   // If the optional node is not supplied, assume we mean the whole document.
-  if (node === undefined) node = document;
+  if (!node) node = wrapIfNeeded(document);
 
   // Find the root of the tree, which will be an Document or ShadowRoot.
   while (node.parentNode) {