title: Typo3 validator returns Call to a member function addError() on null
body: <p>I have a fluid form.On completion of edit an ajax call is passed to controller
  i make an instance of <strong>EmailAddressValidator()</strong> My code is given below</p>
  
  <pre><code>$validate =  \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\Validation\\Validator\\EmailAddressValidator');
  $result = $validate-&gt;isValid('xyz@gmail.com');
  </code></pre>
  
  <p>It returns nothing if the email is in correct format.But it returns </p>
  
  <blockquote>
    <p><strong>Call to a member function addError()</strong></p>
  </blockquote>
  
  <p>if the format is incorrect.</p>