docs: def get_rc_creds():
      """
      Reads ~/.rightscalerc and returns API endpoint and refresh token.
  
      Always returns a tuple of strings even if the file is empty - in which
      case, returns ``('', '')``.
      """
      config = get_config()
      try:
          return (
                  config.get(CFG_SECTION_OAUTH, CFG_OPTION_ENDPOINT),
                  config.get(CFG_SECTION_OAUTH, CFG_OPTION_REF_TOKEN),
                  )
      except:
          return ('', '')