minor noop BeautifulSoup usage tweak

[Ryuno-Ki]

See snarfed@6170b4d

I'd rather spend another minute trying to understand the original implementation before changing it.

[Ryuno-Ki]

Closing.

Adopted the implementation in

webmention-tools/webmentiontools/parser.py

Lines 44 to 54 in 1b79112

	soup = BeautifulSoup(html, "html.parser")
	links_and_anchors = soup.find_all(["link", "a"])
	webmentions = []
	for link_or_anchor in links_and_anchors:
	if link_or_anchor.attrs.get("rel"):
	if "webmention" in link_or_anchor.attrs.get("rel"):
	href = link_or_anchor.attrs.get("href")
	if href is not None:
	webmention_link = _ensure_url(target_url, href)
	webmentions.append(webmention_link)