Landing pull request 459. Do not allow assumed cache[id] in jQuery.da…

…ta. Fixes #8235.

More Details:
 - #459
 - http://bugs.jquery.com/ticket/8235

src/data.js

@@ -51,7 +51,7 @@ jQuery.extend({
 
 		// Avoid doing any more work than we need to when trying to get data on an
 		// object that has no data at all
-		if ( (!id || (pvt && id && !cache[ id ][ internalKey ])) && getByName && data === undefined ) {
+		if ( (!id || (pvt && id && (cache[ id ] && !cache[ id ][ internalKey ]))) && getByName && data === undefined ) {
 			return;
 		}