def _css_select(soup, css_selector):
    """ Returns the content of the element pointed by the CSS selector,
    or an empty string if not found """
    selection = soup.select(css_selector)
    retour = ''
    if len(selection) > 0:
        if hasattr(selection[0], 'text'):
            retour = selection[0].text.strip()
    return retour
