TMDM-7407: create related junit for the jira issue

TMDM-7407: init fix with regressions to be corrected

TMDM-7407: fix PartialUpdate junit failures caused by code UpdateAction

TMDM-7407: "Delete a multi-occurrence field contains complextype sub-field throws NPE"

Changes following code review.
(https://jira.talendforge.org/browse/TMDM-7407)