Error in webform_process_options() if #title not set.

Problem/Motivation

I was unsetting a radio element option in a formAlter in a custom webform handler, like this:

unset($form['elements']['my_radio_select']['#options']['5']);

An error occurred in webform.module::webform_process_options()

Steps to reproduce

The error occurs on the $title = (string) $element[$key]['#title']; line.

Sure, I fixed it by also unsetting the dynamically created child form element:

unset($form['elements']['my_radio_select']['#options']['5']);
unset($form['elements']['my_radio_select']['5']);

However, I think the code could be updated to verify that #title exists before accessing it, since custom modules/code might not know about the dynamically-created child element and that it needs to be unset, or about the automatically added #options_description_display default value if they aren't using it.

function webform_process_options(&$element, FormStateInterface $form_state, &$complete_form) {
  if (!WebformElementHelper::isWebformElement($element)) {
    return $element;
  }

  // Set #webform_element for all options (checkboxes and radios).
  foreach (Element::children($element) as $key) {
    $element[$key]['#webform_element'] = TRUE;
  }

  // Description display.
  if (!empty($element['#options_description_display'])) {
    $description_property_name = ($element['#options_description_display'] === 'help') ? '#help' : '#description';
    foreach (Element::children($element) as $key) {
      $title = (string) $element[$key]['#title'];
      // Check for -- delimiter.
      if (!WebformOptionsHelper::hasOptionDescription($title)) {
        continue;
      }

      [$title, $description] = WebformOptionsHelper::splitOption($title);
      $element[$key]['#title'] = $title;
      $element[$key][$description_property_name] = $description;
    }
  }

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes