[FIX] problem in View class, the is_action_enabled() method assumed the existence of the fields_view attribute despite the fact that class never setted that attribute

bzr revid: nicolas.vanhoren@openerp.com-20121210153646-ulbsja1mt9re25wz

addons/web/static/src/js/views.js

@@ -1206,6 +1206,7 @@ instance.web.View = instance.web.Widget.extend({
             });
         }
         return view_loaded.then(function(r) {
+            self.fields_view = r;
             self.trigger('view_loaded', r);
             // add css classes that reflect the (absence of) access rights
             self.$el.addClass('oe_view')