Error on skipping LDAP Discovery

[protegh]

Describe the bug

Tried to skip the LDAP Discovery in /icingaweb2/setup and got the error

Uncaught TypeError: Argument 1 passed to Icinga\Forms\ConfigForm::transformEmptyValuesToNull() must be of the type array, null given, called in /usr/share/icingaweb2/library/Icinga/Web/Wizard.php on line 290 and defined in /usr/share/icingaweb2/application/forms/ConfigForm.php:156
Stack trace:
#0 /usr/share/icingaweb2/library/Icinga/Web/Wizard.php(290): Icinga\Forms\ConfigForm::transformEmptyValuesToNull()
#1 /usr/share/icingaweb2/modules/setup/application/controllers/IndexController.php(46): Icinga\Web\Wizard->handleRequest()
#2 /usr/share/icingaweb2/library/vendor/Zend/Controller/Action.php(507): Icinga\Module\Setup\Controllers\IndexController->indexAction()
#3 /usr/share/icingaweb2/library/Icinga/Web/Controller/Dispatcher.php(76): Zend_Controller_Action->dispatch()
#4 /usr/share/icingaweb2/library/vendor/Zend/Controller/Front.php(937): Icinga\Web\Controller\Dispatcher->dispatch()
#5 /usr/share/icingaweb2/library/Icinga/Application/Web.php(304): Zend_Controller_Front->dispatch()
#6 /usr/share/icingaweb2/lib in /usr/share/icingaweb2/application/forms/ConfigForm.php on line 156

To Reproduce

1. Run /icingaweb2/setup on a fresh installed icingaweb2 site.
2. On "Authentication" select "LDAP" an click "Next".
3. On "LDAP Discovery" activate the "Skip" checkbox and click "Next".
4. See the above cited error message.

Expected behavior

Load the next Page "LDAP Resource" and let me insert the configuration.

Your Environment

Include as many relevant details about the environment you experienced the problem in

• Icinga Web 2 version and modules (System - About):

Icinga Web 2  2.9.3     
Git Commit    c757a17530c326c7d6daebd6171486cb8167a8a1 
PHP Version   7.4.25    
MODULE  VERSION   
setup  2.9.3     

• Web browser used: Apache 2.4
• Icinga 2 version used (icinga2 --version): r2.13.1-1
• Server operating system and version: Gentoo Linux

[protegh]

The following "fix" worked for me:

--- /usr/share/icingaweb2/modules/setup/application/forms/LdapDiscoveryPage.php	2021-11-12 17:29:33.112684170 +0100
+++ /usr/share/icingaweb2/modules/setup/application/forms/LdapDiscoveryPage.php_orig	2021-11-12 17:29:29.052444674 +0100
@@ -102,7 +102,7 @@
     public function getValues($suppressArrayNotation = false)
     {
         if (! isset($this->discovery) || ! $this->discovery->isSuccess()) {
-            return array();
+            return null;
         }
         $disc = $this->discovery;
         return array(