code: def get_filter_cardborder(*cardborder_type):
      
      filter_ = []
  
      for type_ in cardborder_type:
          if not type_:
              continue
          filter_.append('category_' + APPID_CARDS + '_cardborder[]=tag_' + type_)
  
      return '&'.join(filter_)
docs: Returns game cards URL filter for a given cardborder
      type (TAG_CARDBORDER_NORMAL / TAG_CARDBORDER_FOIL).
  
      To be used in URL_GAMECARDS.
  
      :param str|unicode cardborder_type:
      :rtype: str|unicode