Merge branch 'ged-add-api-to-list-countries-and-subnational-regions' of https://github.com/gem/oq-platform into ged-add-api-to-list-countries-and-subnational-regions
Remove old API of the exposure app, plus some cleanup and little refactoring
Merge branch 'ged-add-api-to-list-countries-and-subnational-regions' of https://github.com/gem/oq-platform into ged-add-api-to-list-countries-and-subnational-regions
resolve merge conflicts
Return a 404 response error if no currency and taxonomy name/version can be retrieved for the given sr_id and occupancy
Merge branch 'ged-add-api-to-list-countries-and-subnational-regions' of https://github.com/gem/oq-platform into ged-add-api-to-list-countries-and-subnational-regions
Merge branch 'ged-add-api-to-list-countries-and-subnational-regions' into exposure-export-UI-changes
Return empty 204 if sr_id and occupancy don't correspond to any study; in case currency is null, do not display the conversions tag
Merge branch 'ged-add-api-to-list-countries-and-subnational-regions' of https://github.com/gem/oq-platform into ged-add-api-to-list-countries-and-subnational-regions
Merge branch 'ged-add-api-to-list-countries-and-subnational-regions' into exposure-export-UI-changes