Missing error handling when set claim fields

[weidonglian]

func (ja *JWTAuth) Encode(claims map[string]interface{}) (t jwt.Token, tokenString string, err error) {
	t = jwt.New()
	for k, v := range claims {
		t.Set(k, v)
	}
	payload, err := ja.sign(t)
	if err != nil {
		return nil, "", err
	}
	tokenString = string(payload)
	return
}

If t.Set(k,v) returns error, we should handle it and error out earlier, instead of now just ignore it ?
Look at the API t.Set(k, v), depending on the key's name, it may fail if we provide a wrong type for that key, e.g. the sub has to be string.