SimplePieのUncaught ValueError: DOMDocument::loadHTML()を解決する【PHP8】

変更点

Locator.php 78行目

if (class_exists('DOMDocument'))
↓
if (class_exists('DOMDocument') && $this->file->body != '')

Locator.php 84行目～

{
  $this->dom->loadHTML($this->file->body);
}
catch (Throwable $ex)