User Login Form returns General Error Page when submitting wilth NULL fields

Hi – when logging in with the Login Form on the Board Index Page, you get the General Error Message page (instead of the normal login page with an error message), when you submit the form without BOTH the USERNAME and PASSWORD fields filled in.

This didn't seem to happen on earlier phpbb3 RC releases, but does so now on the GOLD release...you can see what I mean by doing this (submit blank login form), on this website's forum login too.

I'm sure it's a small fix, and would be nice to have it not do this anymore as it looks buggy and gives a bad User Experience.

Cheers for everything! Oz