'Called when each HTML page belonging to article is downloaded.
Intended to be used to get article metadata like author/summary/etc.
from the parsed HTML (soup).
:param article: A object of class :class:`calibre.web.feeds.Article`.
If you change the summary, remember to also change the text_summary
:param soup: Parsed HTML belonging to this article
:param first: True iff the parsed HTML is the first page of the article.'

def populate_article_metadata(self, article, soup, first):

    pass
