Error when try to save customer without email in admin

[vivazzi]

I get error if I try to save existing customer without email in admin:

NOT NULL constraint failed: auth_user.email

[jrief]

This is because the user is determined by it's email address, rather than by the username.

[vivazzi]

Yes, I see it. I wanted to say that we need to show warning message instead of 500 error.