hotfix/OSIS-3779 fix AttributeError on '/learning_units/xxx/formations/'
hotfix/OSIS-3779 fix AttributeError on '/learning_units/xxx/formations/'

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