Default options form that provides the label widget that all fields should have.
Overrides AreaPluginBase::buildOptionsForm
public function buildOptionsForm(&$form, &$form_state) {
$form['markup'] = array(
'#markup' => '<div class="form-item description">' . t('The handler for this item is broken or missing and cannot be used. If a module provided the handler and was disabled, re-enabling the module may restore it. Otherwise, you should probably delete this item.') . '</div>',
);
}