Remove account email validation for certain scenarios

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.3.4 CE GA5, 7.3.10 DXP GA1, Master
• Component/s: User Management > Business Accounts
• Labels: None
• Fix Priority: 3
• Epic Link: Account Email Domain
• Sprint: U&SM| S03 Sprint 28 | 7.21-8.4
• Git Pull Request: https://github.com/pei-jung/liferay-portal/pull/672

Steps to reproduce:

1. Add an account without any domain set
2. Add an account user to that account
3. Input email address

Expected results: No email validation displays since no domain was listed
Actual results: Email validation displays

1. Remove user to account
2. Edit user and click on email address field

Expected results: No email validation displays since user does not belong to an account
Actual results: Email validation displays,

liferay.com is not a valid domain for the following accounts: No Assigned Account

Reproduced on:
Tomcat 9.0.33 + MySQL 5.7
Portal master GIT ID: 3994ec2ec702175c32939899392b6159acc423f3