diff -r 346c88efed21 -r 5e2f62d02dcd wp/wp-includes/js/wp-backbone.js
--- a/wp/wp-includes/js/wp-backbone.js	Mon Jun 08 16:11:51 2015 +0000
+++ b/wp/wp-includes/js/wp-backbone.js	Tue Jun 09 03:35:32 2015 +0200
@@ -340,10 +340,12 @@
 		// The constructor for the `Views` manager.
 		Subviews: wp.Backbone.Subviews,
 
-		constructor: function() {
+		constructor: function( options ) {
 			this.views = new this.Subviews( this, this.views );
 			this.on( 'ready', this.ready, this );
 
+			this.options = options || {};
+
 			Backbone.View.apply( this, arguments );
 		},