code: def _parse_alt_title(html_chunk):
      
      title = html_chunk.find("img", fn=has_param("alt"))
  
      if not title:
          raise UserWarning("Can't find alternative title source!")
  
      return title[0].params["alt"].strip()
docs: Parse title from alternative location if not found where it should be.
  
      Args:
          html_chunk (obj): HTMLElement containing slice of the page with details.
  
      Returns:
          str: Book's title.