OSIS-1211 Removed duplicate code for search proposal and learning unit year
OSIS-1211 Removed duplicate code for search proposal and learning unit year

	modified:   base/models/proposal_learning_unit.py

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