Blackberry 4.6 is capable of finding elements that are no longer in t…

…he DOM via getElementById. It only appears to happen when the node has been inside of a cloned Document Fragment. Fixes #6963.

src/core.js

@@ -119,7 +119,9 @@ jQuery.fn = jQuery.prototype = {
 				} else {
 					elem = document.getElementById( match[2] );
 
-					if ( elem ) {
+					// Check parentNode to catch when Blackberry 4.6 returns
+					// nodes that are no longer in the document #6963
+					if ( elem && elem.parentNode ) {
 						// Handle the case where IE and Opera return items
 						// by name instead of ID
 						if ( elem.id !== match[2] ) {