Ticket #54631: 54631-no-update-message-if-not-configured.diff

src/wp-admin/includes/update.php

@@ -807 +807 @@
  * @return void|false
  */
 function maintenance_nag() {
+
+        if (!defined('WP_AUTO_UPDATE_CORE'))
+                define('WP_AUTO_UPDATE_CORE', true);
+        if ( false === WP_AUTO_UPDATE_CORE )
+                return array();
+
         // Include an unmodified $wp_version.
         require ABSPATH . WPINC . '/version.php';
         global $upgrading;