OSIS-5072-bis use defaultdict instead of setdefault inside the forloop
OSIS-5072-bis use defaultdict instead of setdefault inside the forloop

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