[Backend Navbar] Empty spaces in the classes about magento-lts HOT 5 CLOSED

    /**
     * Get menu level HTML code
     *
     * @param array $menu
     * @param int $level
     * @return string
     */
    public function getMenuLevel($menu, $level = 0)
    {
        $html = '<ul ' . (!$level ? 'id="nav"' : '') . '>' . PHP_EOL;
        foreach ($menu as $item) {
            if ((empty($item['url']) || ($item['url'] == '#')) && empty($item['children'])) {
                continue; // for example hide System/Tools when empty
            }
            $html .= '<li ' . (!empty($item['children']) ? 'onmouseover="Element.addClassName(this,\'over\')" '
                . 'onmouseout="Element.removeClassName(this,\'over\')"' : '') . ' class="'
                . (!$level && !empty($item['active']) ? ' active' : '') . ' '
                . (!empty($item['children']) ? ' parent' : '')
                . (!empty($level) && !empty($item['last']) ? ' last' : '')
                . ' level' . $level . '"> <a href="' . $item['url'] . '" '
                . (!empty($item['title']) ? 'title="' . $item['title'] . '"' : '') . ' '
                . (!empty($item['target']) ? 'target="' . $item['target'] . '"' : '') . ' '
                . (!empty($item['click']) ? 'onclick="' . $item['click'] . '"' : '') . ' class="'
                . (!empty($item['active']) ? 'active' : '') . '"><span>'
                . $this->escapeHtml($item['label']) . '</span></a>' . PHP_EOL;
            if (!empty($item['children'])) {
                $html .= $this->getMenuLevel($item['children'], $level + 1);
            }
            $html .= '</li>' . PHP_EOL;
        }
        $html .= '</ul>' . PHP_EOL;

        return $html;
    }