From cb40495b21bcb7802f3ab6ae0f837f2bf5b385ed Mon Sep 17 00:00:00 2001
From: John Resig <jeresig@gmail.com>
Date: Tue, 24 Aug 2010 07:28:47 -0700
Subject: [PATCH] Make sure that missing attributes return undefined in
 Blackberry 4.7. Fixes #6938.

---
 src/attributes.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/attributes.js b/src/attributes.js
index d2fc202b2..719c368af 100644
--- a/src/attributes.js
+++ b/src/attributes.js
@@ -325,6 +325,12 @@ jQuery.extend({
 				elem.setAttribute( name, "" + value );
 			}
 
+			// Ensure that missing attributes return undefined
+			// Blackberry 4.7 returns "" from getAttribute #6938
+			if ( !elem.attributes[ name ] && !elem.hasAttribute( name ) ) {
+				return undefined;
+			}
+
 			var attr = !jQuery.support.hrefNormalized && notxml && special ?
 					// Some attributes require a special call on IE
 					elem.getAttribute( name, 2 ) :
-- 
2.39.5