code: def _parse_description(details):
      
      description = details.find("div", {"class": "detailPopis"})
  
      # description not found
      if not description:
          return None
  
      # remove links to ebook version
      ekniha = description[0].find("div", {"class": "ekniha"})
      if ekniha:
          ekniha[0].replaceWith(dhtmlparser.HTMLElement(""))
  
      # remove links to other books from same cathegory
      detail = description[0].find("p", {"class": "detailKat"})
      if detail:
          detail[0].replaceWith(dhtmlparser.HTMLElement(""))
  
      # remove all HTML elements
      description = dhtmlparser.removeTags(description[0]).strip()
  
      # description is blank
      if not description:
          return None
  
      return description
docs: Parse description of the book.
  
      Args:
          details (obj): HTMLElement containing slice of the page with details.
  
      Returns:
          str/None: Details as string with currency or None if not found.