Replacing switchToTab with routes

OHIFViewer/client/routes.js

@@ -1,8 +1,6 @@
 import { Session } from 'meteor/session';
 import { Router } from 'meteor/iron:router';
 
-Session.setDefault('ViewerData', {});
-
 Router.configure({
     layoutTemplate: 'layout',
     loadingTemplate: 'layout'
@@ -31,4 +29,4 @@ Router.route('/viewer/:_id', {
             }
         });
     }
-});
+});