OSIS-1856 No message warning when group reuse acronym of group
OSIS-1856 No message warning when group reuse acronym of group

	modified:   base/models/education_group_year.py

uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/OSIS-Louvain