Fix PHP 8.1 tests

src/Readability.php

@@ -264,9 +264,13 @@ class Readability implements LoggerAwareInterface
         $overlay->appendChild($innerDiv);
 
         // without tidy the body can (sometimes) be wiped, so re-create it
+        try {
             if (!(property_exists($this->body, 'childNodes') && null !== $this->body->childNodes)) {
                 $this->body = $this->dom->createElement('body');
             }
+        } catch (\Exception $e) {
+            $this->body = $this->dom->createElement('body');
+        }
 
         // Clear the old HTML, insert the new content.
         $this->body->setInnerHtml('');