Add support to "serialize" option when set to true

When the viewBuilder's "serialize" option is set to true, all the view
variables are serialized. Some controllers classes can use this feature
in your 'initialize' methods to avoid set up this option in all your
actions.

[1] - https://api.cakephp.org/4.2/class-Cake.View.JsonView.html
[2] - https://api.cakephp.org/4.2/class-Cake.View.XmlView.html

Author: LukeC8

src/Controller/Component/ApiPaginationComponent.php

@@ -59,8 +59,11 @@ public function beforeRender(Event $event)
 
         $subject->set($config['key'], $this->pagingInfo);
         $data = $subject->viewBuilder()->getOption('serialize') ?? [];
-        $data[] = $config['key'];
-        $subject->viewBuilder()->setOption('serialize', $data);
+
+        if (is_array($data)) {
+            $data[] = $config['key'];
+            $subject->viewBuilder()->setOption('serialize', $data);
+        }
     }
 
     /**