title: Odoo Pos - QWeb2: Error while extending template No expression given
body: <p>I am using Odoo 9 and I am trying to copy a payment button. I want to copy the 50+ button over to the left side.</p>
  
  <p><a href="https://i.stack.imgur.com/m1XHl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/m1XHl.png" alt="enter image description here"></a></p>
  
  <p>I tried adding </p>
  
  <pre><code>&lt;t t-extend="PaymentScreen-Paymentmethods"&gt;
          &lt;div class="paymentmethods"&gt;
              &lt;button class="mode-button" data-action='+50'&gt;+50&lt;/button&gt;
          &lt;/div&gt;
              &lt;/t&gt;
  </code></pre>
  
  <p>But all I get is a black screen in the POS. When I inspect element on the page i get the following error</p>
  
  <pre><code>Error: QWeb2: Error while extending template 'PaymentScreen-PaymentmethodsNo expression given
  </code></pre>