Users: In `wp_insert_user()`, account for the `wp_pre_insert_user_data` filter returning empty data.

Props juliobox, SergeyBiryukov.
Fixes #47902.
Built from https://develop.svn.wordpress.org/trunk@45858


git-svn-id: http://core.svn.wordpress.org/trunk@45669 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/user.php

@@ -1794,6 +1794,10 @@ function wp_insert_user( $userdata ) {
 	 */
 	$data = apply_filters( 'wp_pre_insert_user_data', $data, $update, $update ? (int) $ID : null );
 
+	if ( empty( $data ) || ! is_array( $data ) ) {
+		return new WP_Error( 'empty_data', __( 'Not enough data to create this user.' ) );
+	}
+
 	if ( $update ) {
 		if ( $user_email !== $old_user_data->user_email ) {
 			$data['user_activation_key'] = '';

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45857';
+$wp_version = '5.3-alpha-45858';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.