Attr: Use typeof check for getAttribute method

Ref 29838b6cab

src/attributes/attr.js

@@ -32,7 +32,7 @@ jQuery.extend({
 		}
 
 		// Fallback to prop when attributes are not supported
-		if ( !elem.getAttribute ) {
+		if ( typeof elem.getAttribute === "undefined" ) {
 			return jQuery.prop( elem, name, value );
 		}