OSIS-5403 : Refactor and raise error if bad file in folder
OSIS-5403 : Refactor and raise error if bad file in folder

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