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 ``('', '')``.

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 ('', '')