Fix error when no modules set

https://docs.humhub.org/docs/admin/requirements lists php 7.4 as minimum requirement. Hence, the array properties should actually be arrays.

This caused log targets to be disabled due to the `ModuleManager::getModules()` throwing an error when `ModuleManager::$modules` would be null.

CHANGELOG.md

@@ -3,6 +3,7 @@ HumHub Changelog
 
 1.13.2 (Unreleased)
 -------------------------
+- Fix #6195: Fix ModuleManager disabling logging when now modules set
 - Fix #5965: Suppress log warning 'Invalid session auth key attempted for user'
 - Fix #6084: Automatic LDAP user registration broken when not all req. attributes provided
 - Fix #6104: Fix update user with not existing group

protected/humhub/components/ModuleManager.php

@@ -70,9 +70,9 @@ class ModuleManager extends Component
      * List of all modules
      * This also contains installed but not enabled modules.
      *
-     * @param array $config moduleId-class pairs
+     * @param array $modules moduleId-class pairs
      */
-    protected $modules;
+    protected $modules = [];
 
     /**
      * List of all enabled module ids