Login form doesn't report errors to the user

[mkeen]

Try to sign up at /register with a blank form to see the expected behavior

If you try to log in at /login with a blank form and you get redirected to a blank page instead of seeing the form errors

[nicdev]

I think the issue is that the CC area has front end validation, while the rest of the form doesn't. I'll add FE validation to it, and also test that BE validation works as well.