- fixed null issue in study view
- fixed null issue in study view

TNO/PhenotypeDatabase,NetherlandsMetabolomicsCentre/GSCF,PhenotypeFoundation/PhenotypeDatabase,PhenotypeFoundation/PhenotypeDatabase-legacy,thehyve/GSCF,NetherlandsMetabolomicsCentre/GSCF,TNO/PhenotypeDatabase,PhenotypeFoundation/PhenotypeDatabase,thehyve/GSCF,PhenotypeFoundation/PhenotypeDatabase-legacy,PhenotypeFoundation/PhenotypeDatabase-legacy