add_filter('salient_register_core_wpbakery_els','salient_child_wpbakery_els');

function salient_child_wpbakery_els() {
  return array('vc_empty_space', 'vc_section', 'vc_single_image', 'vc_hoverbox', 'vc_message', 'vc_btn', 'vc_cta', 'vc_empty_space', 'vc_button');
}