Redirect to root from '/donate' if the plugin is disabled

assets/javascripts/discourse/routes/donate.js.es6

@@ -1,8 +1,16 @@
 import DiscourseRoute from "discourse/routes/discourse";
+import DiscourseURL from 'discourse/lib/url';
 import { popupAjaxError } from 'discourse/lib/ajax-error';
 import { ajax } from 'discourse/lib/ajax';
 
 export default DiscourseRoute.extend({
+  redirect() {
+    if (!Discourse.SiteSettings.discourse_donations_enabled) {
+      DiscourseURL.routeTo('/');
+      return;
+    }
+  },
+
   setupController(controller) {
     let charges = [];
     let subscriptions = [];
@@ -24,6 +32,6 @@ export default DiscourseRoute.extend({
       });
     }).catch(popupAjaxError).finally(() => {
       controller.set('loadingDonations', false);
-    })
+    });
   }
 });