After deleting a user (send to trash and empty trash), it's impossible to create another user with the same username.

Steps to reproduce

• Create a user (username: john, password: publish, email: john.doe@ez.no)
• Delete this user (Content object is sent to the Trash)
• Go to the trash
• Empty the trash
• Go back to Users in Admin Panel
• Create a new user using the same values as step 1

Result:

Argument 'userCreateStruct' is invalid: User with provided login already exists

It seems that the ezuser database table still has the entry

Expected result:

Website administrators should be able to create a new user account using the same username if the previous account is not in the trash.