Account Confirmation Email Incorrectly Displays "None" Before User Email Address

### Description

While reviewing the account confirmation email, I noticed that the word "None" is incorrectly included in the email text. According to the email template defined in the ticket, this word should not be displayed.
Note: This issue is reproducible in both the QA and Staging environments.

### Steps to Reproduce

1. Open the site.
2. Go to Log In.
3. Select Create Account.
4. Enter valid account information and click the Create Account button.
5. Verify that a confirmation email is sent to the user's email address.
6. Open the confirmation email and review its content.

### Actual Result

The confirmation email includes the following text:

> "You're receiving this email because user **None** [{{email_address}} has given your email address

The word "None" is incorrectly displayed before the user's email address.

### Expected Result

The word "None" should not be displayed. The text should match the expected email template:
"You're receiving this email because user {{email_address}} has given your email address to register an account on [www.boost.org](http://www.boost.org/)."

Start by locating the account confirmation email template used by the Log In and Create Account flow, then compare its rendered text with the expected template in the issue. Confirm that the completed email no longer displays “None” before the user's email address and that the rest of the message remains correct.

Written by the indexing model from the issue text.