Login-free customer portal it does not create a customer account in case there is a leading/trailing blank space on the user email

Summary

Login-free customer portal it does not create a customer account in case there is a trailing blank space.

Steps to Reproduce

1. Enable the login-free portal.
2. Access the portal and try to raise a request.
3. On the email confirmation to field start by adding either a leading or trailing space and then complete with your email.
4. Submit the request.

Expected Results

Jira should remove the blank space and create the request.

Actual Results

At customer portal the below error message is shown:

Couldn't send request
Signup is not currently available

The below exception is thrown in logs:

stack:	 com.atlassian.jira.exception.CreateException: com.atlassian.crowd.exception.InvalidUserException: User name may not contain leading or trailing whitespace

Notes:
It seems a regression of JSDCLOUD-4134.

Workaround

Remove the trailing spaces and submit the request once again.