nulab/scala-oauth2-provider — pull request #20 by gertjana (2014-08-08 09:49:17+00:00)
Title: Invalid Grant returned when datahandler.findUser() returns None

Is this by design (not giving a potential hacker too much information)
or could we give back an "Invalid User or Password" which will help

scalaoauth2.provider.GrantHandler.scala line 63:

val user = dataHandler.findUser(username, password).getOrElse(throw new InvalidGrant())

I could do a pull request if required