webform_grid types not being hidden when in a hidden fieldset

Steps to reproduce:

1. Create a basic form with a yes/no question to start.
2. Create a fieldset, we'll call it fieldset 'A'. Make this fieldset conditional on step 1 being 'Yes'.
3. Create a grid type within fieldset A, populate it with a few options and questions, make sure its required.
4. Try submitting the form with step 1 answer set to 'No'.

You'll get errors saying the questions in the grid are required.

I've traced it to this function:

/**
 * When the form is being built AFTER it is submitted then this function will make components that were hidden not required
 * @param $form_element
 * @param $form_state
 *
 * @return boolean
 */
function webform_conditional_element_after_build($form_element, &$form_state) {
  //only do this when the form is being submitted NOT displayed
  if (!empty($form_state['input'])) {
    $submitted_values = _webform_conditional_get_submitted_values($form_state);
    //load the components into a flattened array
    $components = _webform_conditional_get_all_components($form_element['#webform_component']['nid'], $submitted_values);
    $was_hidden = _webform_conditional_was_hidden($form_element['#webform_component']['cid'], $components);
    if ($was_hidden) {
      $form_element['#required'] = FALSE;
      _webform_condtional_clear_element_values($form_element);
    }
  }
  return $form_element;

}

was_hidden will function properly, but there are sub-arrays in $form_element that need to have their #required value set to false. It's tricky to identify them as the array names are the keys to the questions, so it will be different to everyone.

My recommended solution would be to cycle through the form_element recursively when the type is 'webform_grid' and set all '#required' keys to FALSE. This might also require a special case in _webform_condtional_clear_element_values(&$elements) for webform_grid that would do a similar thing for clearing values.

Will attempt a patch and post shortly.