LPS-51248

I have added "emailAddress" to _USER_PROPERTY_NAMES in order to be able to not replicate email address from LDAP if email is optional at liferay.
 - Before this modified class it is a validation that check if email == "" at LDAP and email is required at Liferay, and it throws a exception
 - So if email it is required at Liferay, with my changes, all will continue working as expected.