PHP fix for no admin template

gistfile1.php

$template = $db->loadObject();

			if ($template !== null)
			{
				$template->template = JFilterInput::getInstance()->clean($template->template, 'cmd');
				$template->params = new JRegistry($template->params);
			}
			else
			{
				$template = new stdClass;
				$template->params = new JRegistry;
				$template->template = 'isis';
			}

			if (!file_exists(JPATH_THEMES . '/' . $template->template . '/index.php'))
			{
				$template->params = new JRegistry;
				$template->template = 'isis';
			}