LPS-40558 Use "==" instead of Validator.isNull(Object)
LPS-40558 Use "!=" instead of Validator.isNotNull(Object)
LPS-40558 Do not need Validator.isNull()/isNotNull() checking.
LPS-40558 Use Validator.isNull(String) instead of Validator.isNull(Object)
LPS-40558 Don't merge in GroupFinderImpl change yet. Discussing with SZ