title: How to implement not with if statement in Ember Handlebars?
body: <p>I have a statement like this:</p>
  
  <pre><code>{{#if IsValid}}
  </code></pre>
  
  <p>I want to know how I can use a negative <code>if</code> statement that would look like that:</p>
  
  <pre><code>{{#if not IsValid}}
  </code></pre>