From eb857e2b714e6786078cf8641941f267a6e19fa0 Mon Sep 17 00:00:00 2001
From: timmywil <tim.willison@thisismedium.com>
Date: Mon, 11 Apr 2011 11:54:55 -0400
Subject: [PATCH] Fix unit tests in firefox 4 and opera 11, passing null or
 undefined to indexOf was throwing an error in those browsers

---
 src/traversing.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/traversing.js b/src/traversing.js
index fb5946bb..485de56d 100644
--- a/src/traversing.js
+++ b/src/traversing.js
@@ -298,13 +298,18 @@ jQuery.extend({
 
 // Implement the identical functionality for filter and not
 function winnow( elements, qualifier, keep ) {
+
+	// Can't pass null or undefined to indexOf in Firefox 4
+	// Set to 0 to skip string check
+	qualifier = qualifier || 0;
+
 	if ( jQuery.isFunction( qualifier ) ) {
 		return jQuery.grep(elements, function( elem, i ) {
 			var retVal = !!qualifier.call( elem, i, elem );
 			return retVal === keep;
 		});
 
-	} else if ( qualifier && qualifier.nodeType ) {
+	} else if ( qualifier.nodeType ) {
 		return jQuery.grep(elements, function( elem, i ) {
 			return (elem === qualifier) === keep;
 		});