TMDM-7902: to avoid remove same repository object more times.
Merge branch 'maintenance/5.6' of https://github.com/Talend/tmdm-studio-se into maintenance/5.6
TMDM-7950: Showing combo control instead of combo cell editor
Merge branch 'maintenance/5.6' of https://github.com/Talend/tmdm-studio-se into maintenance/5.6
Merge branch 'maintenance/5.6'