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функция не описана

WP_Themes_List_Table::no_items() public WP 1.0

Это метод класса: WP_Themes_List_Table{}

Хуков нет.

Возвращает

Null. Ничего.

Использование

$WP_Themes_List_Table = new WP_Themes_List_Table();
$WP_Themes_List_Table->no_items();

Код WP_Themes_List_Table::no_items() WP 5.5.1

wp-admin/includes/class-wp-themes-list-table.php
<?php
public function no_items() {
	if ( $this->search_terms || $this->features ) {
		_e( 'No items found.' );
		return;
	}

	$blog_id = get_current_blog_id();
	if ( is_multisite() ) {
		if ( current_user_can( 'install_themes' ) && current_user_can( 'manage_network_themes' ) ) {
			printf(
				/* translators: 1: URL to Themes tab on Edit Site screen, 2: URL to Add Themes screen. */
				__( 'You only have one theme enabled for this site right now. Visit the Network Admin to <a href="%1$s">enable</a> or <a href="%2$s">install</a> more themes.' ),
				network_admin_url( 'site-themes.php?id=' . $blog_id ),
				network_admin_url( 'theme-install.php' )
			);

			return;
		} elseif ( current_user_can( 'manage_network_themes' ) ) {
			printf(
				/* translators: %s: URL to Themes tab on Edit Site screen. */
				__( 'You only have one theme enabled for this site right now. Visit the Network Admin to <a href="%s">enable</a> more themes.' ),
				network_admin_url( 'site-themes.php?id=' . $blog_id )
			);

			return;
		}
		// Else, fallthrough. install_themes doesn't help if you can't enable it.
	} else {
		if ( current_user_can( 'install_themes' ) ) {
			printf(
				/* translators: %s: URL to Add Themes screen. */
				__( 'You only have one theme installed right now. Live a little! You can choose from over 1,000 free themes in the WordPress Theme Directory at any time: just click on the <a href="%s">Install Themes</a> tab above.' ),
				admin_url( 'theme-install.php' )
			);

			return;
		}
	}
	// Fallthrough.
	printf(
		/* translators: %s: Network title. */
		__( 'Only the current theme is available to you. Contact the %s administrator for information about accessing additional themes.' ),
		get_site_option( 'site_name' )
	);
}