code: func (OAuth2) IsAccountReady(acctNode *Object) (ok bool, err error) {
  	if acctNode.Attr(AcctAttrUserID) != "" &&
  		acctNode.Attr(AcctAttrAccessToken) != "" {
  		return true, nil
  	}
  	return false, nil
  }
docs: // IsAccountReady returns whether the account has been properly configured
  // - whether the user ID and access token has been stored in the given account node.