Responsible for passing a NewscrawlerItem to the pipeline if the
        response contains an article.

        :param obj response: the scrapy response to work on
        :param str source_domain: the response's domain as set for the crawler
        :param str original_url: the url set in the json file
        :param str rss_title: the title extracted by an rssCrawler
        :return NewscrawlerItem: NewscrawlerItem to pass to the pipeline

def pass_to_pipeline_if_article(
            self,
            response,
            source_domain,
            original_url,
            rss_title=None
    ):
        """
        Responsible for passing a NewscrawlerItem to the pipeline if the
        response contains an article.

        :param obj response: the scrapy response to work on
        :param str source_domain: the response's domain as set for the crawler
        :param str original_url: the url set in the json file
        :param str rss_title: the title extracted by an rssCrawler
        :return NewscrawlerItem: NewscrawlerItem to pass to the pipeline
        """
        if self.helper.heuristics.is_article(response, original_url):
            return self.pass_to_pipeline(
                response, source_domain, rss_title=None)