Length Properties with Conditionals

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  track1: {
    title: 'Test Track 1',
    artist: 'Test Artist 1',
    length: 0
  },
  track2: {
    title: 'Test Track 2',
    artist: 'Test Artist 2',
    length: 200
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#if track1}}
{{track1.title}} works!
{{/if}}
{{#if track2}}
{{track2.title}} works!
{{/if}}
<br>
<br>

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "canary",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "canary"
  }
}