add: try/except for checking gradient files
add: try/except for checking gradient files

sibis-platform/ncanda-datacore,sibis-platform/ncanda-datacore,sibis-platform/ncanda-data-integration,kipohl/ncanda-data-integration,kipohl/ncanda-data-integration,sibis-platform/ncanda-data-integration,sibis-platform/ncanda-datacore,kipohl/ncanda-data-integration