title: Zend Framework 2 - Removed form element causes validation to fail
body: <p>I use a certain form in several places. In one of them I need to ignore a form element which I set programmatically after the validation.</p>
  
  <p>Because it's just an exception I don't want to create a new form. So I thought, I just remove this element in the controller like:</p>
  
  <pre><code>$myForm-&gt;remove('myElement');
  </code></pre>
  
  <p>The problem is that the form now won't validate. I don't get any errors but the <code>$myForm-&gt;isValid()</code> just returns an empty value.</p>
  
  <p>Any ideas what I might be doing wrong?</p>
  
  <p>Thanks!</p>