Fixed fatal error for php8

CRM/Documents/Page/ContactDocuments.php

@@ -22,12 +22,12 @@ class CRM_Documents_Page_ContactDocuments extends CRM_Core_Page {
     $filter = CRM_Utils_Request::retrieve('filter', 'String');
     $this->assign('snippet', $snippet && $filter ? true : false);
     $type_id = CRM_Utils_Request::retrieve('type_id', 'String');
-    $type_ids = null;
+    $type_ids = [];
     if ($type_id) {
       $type_ids = explode(",", $type_id);
     }
     $status_id = CRM_Utils_Request::retrieve('status_id', 'String');
-    $status_ids = null;
+    $status_ids = [];
     if ($status_id) {
       $status_ids = explode(",", $status_id);
     }