title: Chameleon ZPT templates
body: <p>I have created a .pt template as that contains the following snippet</p>
  
  <pre><code>&lt;span class="help-block"&gt;
     ${password_confirm}
  &lt;/span&gt;
  </code></pre>
  
  <p>My Problem is that the password_confirm field will not always be rendered by pyramid framework so it displays the error below</p>
  
  <pre><code>chameleon.utils.NameError
  
  NameError: password_confirm
  </code></pre>
  
  <p>I understand i am suppose to use a tal:condition but everything i am trying is failing. Can someone help me on how i am suppose to go about variables that will not always be rendered in the template.</p>