controllers/crate/version: Extract computed "extraDownloads" property

Author: Turbo87

app/controllers/crate/version.js

@@ -10,6 +10,10 @@ export default Ember.Controller.extend({
     isDownloading: false,
 
     fetchingDownloads: true,
+    extraDownloads: Ember.computed('downloads.meta.extra_downloads', function() {
+        return this.get('downloads.meta.extra_downloads') || [];
+    }),
+
     fetchingFollowing: true,
     following: false,
     currentVersion: computed.alias('model'),

app/routes/crate/version.js

@@ -55,7 +55,6 @@ export default Ember.Route.extend({
         context.get('version_downloads').then(downloads => {
             controller.set('fetchingDownloads', false);
             controller.set('downloads', downloads);
-            controller.set('extraDownloads', downloads.get('meta.extra_downloads') || []);
         });
     },