Fail when scenario can't be build from JSON file.
Fail when scenario can't be build from JSON file.

adrienpacifico/openfisca-france,sgmap/openfisca-france,SophieIPP/openfisca-france,antoinearnoud/openfisca-france,benjello/openfisca-france,adrienpacifico/openfisca-france,antoinearnoud/openfisca-france,benjello/openfisca-france,sgmap/openfisca-france,SophieIPP/openfisca-france