fix: [AoU-1360] Complete error message from import multiple

https://issues.unige.ch/browse/AOU-1360

To test with: solidify/solidify-frontend!88 (merged)

Reminder : Procedure to test solidify frontend branch

1. Pull dlcm and solidify branches
2. npm i on solidify (allow to retrieve required lib)
3. npm i on aou-portal (allow to retrieve required lib)
4. npm run build-solidify on aou-portal (allow to override solidify lib from nexus with local build)
5. npm run start on aou-portal to run the app