Running 2 accounts with a single email #3

How it was found

Following the fixes: #241608 & #224072. there's still another way round this.

Reproduction Steps

1. Register 2 accounts (Preferably using Gmail not third party)

• Login both accounts on separate browsers
• In Browser1, navigate to https://demo.weblate.org/accounts/profile/#auth
• Add a new association with the Google third party link using the registered email address in Browser2
• Fill the Password and Add the Association
• Disconnect the email on the account initially
• Email will be changed to the new one added in (4)
• Now, both browsers have the same email address i.e 2 accounts with a single email
• Logging out any of the account and trying to login leads to a server error.

Screenshots are attached below.

Shuaib.