[5.4] PHP8.5 deprecated code (joomla#46134)

* PHP8.5 deprecated
* Update HtmlDocument.php

---------

Co-authored-by: Tuan Pham Ngoc <[email protected]>

Author: dgrammatiko

libraries/src/Document/HtmlDocument.php

@@ -528,7 +528,8 @@ public function getBuffer($type = null, $name = null, $attribs = [])
             return parent::$_buffer;
         }
 
-        $title = $attribs['title'] ?? null;
+        $name  ??= '';
+        $title = $attribs['title'] ?? '';
 
         if (isset(parent::$_buffer[$type][$name][$title])) {
             return parent::$_buffer[$type][$name][$title];
@@ -558,12 +559,14 @@ public function getBuffer($type = null, $name = null, $attribs = [])
                 return Cache::getWorkarounds($cbuffer[$hash], ['mergehead' => 1]);
             }
 
-            $options               = [];
-            $options['nopathway']  = 1;
-            $options['nomodules']  = 1;
-            $options['modulemode'] = 1;
+            $options = [
+                'nopathway'  => 1,
+                'nomodules'  => 1,
+                'modulemode' => 1,
+            ];
 
             $this->setBuffer($renderer->render($name, $attribs, null), $type, $name);
+
             $data = parent::$_buffer[$type][$name][$title];
 
             $tmpdata = Cache::setWorkarounds($data, $options);