code: def _get_element_text_or_none(document, selector):
      
      element = document.cssselect(selector)
      if element:
          return element[0].text
      return None
docs: Using a CSS selector, get the element and return the text, or None if no element.
  
      :arg document: ``HTMLElement`` document
      :arg selector: CSS selector
      :returns: str or None