User Registration throw exception when no email or username were provided

[MikeAlhayek]

Describe the bug

User Registration throw exception when no email or username were provider

Orchard Core version

main

To Reproduce

Steps to reproduce the behavior:

1. try to register a new user
2. leave all the fields empty and submit

Expected behavior

The form should render with the errors.

Logs and screenshots

If applicable, add log files, browser console logs, and screenshots (or screen recording videos) to help explain your problem.

[github-actions]

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