Default WordPress menu content
Use the fallback_cb argument of wp_nav_menu(): (callable|bool) If the menu doesn’t exists, a callback function will fire. Default is ‘wp_page_menu’. Set to false for no fallback. <?php wp_nav_menu( array( ‘theme_location’ => ‘main_menu_4’, ‘fallback_cb’ => false ‘depth’ => 1, ) ); ?>