Show login errors in Community Auth

Hi, skunbad.

Firstly, sorry for write two post about my problem. I know that you are very busy and that you are the one that worked about Community Auth, but I think that other members could help me about this question.

Respectly your answer, I am agree about your recommendations. I just had worked about client side validation, but I was thinking if user deactivate javascript. However, like you said, I wasn't thought about validation could offers sensible information to bad users like attackers.

Thank you very much.