Improvement Plugin EnhancedLogin

- A validation was added validation for login.
Merge pull request #2512 from Jennydmz/master

BUG-15384 Issue in the field check-box from Dynaform with the label.
Improvement Plugin EnhancedLogin

- A validation was added validation for login.
Improvement Plugin EnhancedLogin

- A validation was added validation for login.
Merge pull request #2514 from marcoAntonioNina/master

Improvement Plugin EnhancedLogin
Fixing Notice in fields handler by an empty variable usage.