OSIS-4114-dev fix unittest for test_get_next_academic_years()
OSIS-4114-dev fix unittest for test_get_next_academic_years()

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