Drop unnecessary data initialization.

It is set in `afterModel` before being accessed by `setupController`.

Author: CvX

app/routes/dashboard.js

@@ -5,8 +5,6 @@ import RSVP from 'rsvp';
 import AuthenticatedRoute from '../mixins/authenticated-route';
 
 export default Route.extend(AuthenticatedRoute, {
-    data: {},
-
     setupController(controller) {
         this._super(...arguments);