Backbone notifications secondary actions

Handle secondary actions on notifications either specified as a single object,
or as a list of objects. Under the hood, the initialize method converts a single
object to a list containing a single object.

cms/static/js/views/feedback.js

@@ -49,6 +49,11 @@ CMS.Views.SystemFeedback = Backbone.View.extend({
         }
         this.template = _.template(tpl);
         this.setElement($("#page-"+this.options.type));
+        // handle single "secondary" action
+        if (this.options.actions && this.options.actions.secondary &&
+            !_.isArray(this.options.actions.secondary)) {
+            this.options.actions.secondary = [this.options.actions.secondary];
+        }
         return this;
     },
     // public API: show() and hide()