If count

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  fooCount: 0
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#if fooCount}}
  <p>FooCount is greater than zero</p>
{{else}}
	<p>FooCount is zero or undefined</p>
{{/if}}
<br>
<br>

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}