MAAS new user creation requires E-Mail address, throws wrong error when not provided

[Dan Poler]

Steps to reproduce:
Log into MAAS
Click on the gear
Click "Add User"
Give the user a username and full name
Do not give the user an email address
Set the user's password
Do not make the user an administrator
Click Add User

Expected behavior
The user should be created

Observed behavior
The creation will error out with"User with this E-mail address already exists."

Why this is a problem
1. Whereas the username, password, and password confirmation fields are marked as required in the GUI, the E-Mail address is not marked as required. Either mark the field as required, or allow the creation to succeed as outlined above

2. The error is incorrect. When no email address is specified, the E-Mail address cannot possibly already exist.

[Julian Edwards (julian-edwards)]

Thanks for the bug.

[Raphaël Badin (rvb)]

> 2. The error is incorrect. When no email address is specified, the E-Mail address cannot possibly already exist.

There is a MAAS "system user" which has an empty email address, and that's why you're getting this error.

But you're right about the fact that the error is confusing and we should fix that.