import bs4


def strip_html_tags(html: str | None) -> str:
    if html is None:
        return ""
    soup = bs4.BeautifulSoup(html, "html.parser")
    for tag in soup(["script", "style", "noscript", "template"]):
        tag.decompose()
    return " ".join(soup.get_text(separator=" ", strip=True).split())