[BUG] FastAuth still trys to login even if the account doesn't exist

[DavidM-D]

FastAuth seems willing to send emails to people without accounts asking them to verify their email account. If you click the link it fails with Account Not Found in the URL bar.

Ideally:

1. The email wouldn't get sent
2. The wording of the confirmation screen would be something to the effect of, "if you have an account at this email address, we'll send you an email".
3. The error message would be somewhere on the page rather than in the URL bar.

Steps to reproduce:

1. Go to near.org and click sign in
2. Enter an email that doesn't have a FastAuth account
3. Click Sign in
4. Click the link sent to the email address