OSIS-4205 omit learning unit without element in borrowed search
OSIS-4205 omit learning unit without element in borrowed search

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