OSIS-4266-4 correct comparaison between None and int
OSIS-4266-4 correct comparaison between None and int

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