/**
* Performs validation of the provided form.
* @param Form $form The form to validate
* @return null
*/
public function isValid(Form $form)
{
$username = $form->getUsername();
$email = $form->getEmail();
if (!$username && !$email) {
$error = new ValidationError(self::TRANSLATION_ERROR_NO_INPUT, 'Please provide a username or a password');
$validationException = $form->getValidationException();
$validationException->addErrors(ResetPasswordForm::FIELD_USERNAME, array($error));
}
}
