message: fix(datasets): log create exceptions as warning
diff: @@ -61,7 +61,7 @@ class CreateDatasetCommand(BaseCommand):
  )
  db.session.commit()
  except (SQLAlchemyError, DAOCreateFailedError) as ex:
  - logger.exception(ex)
  + logger.warning(ex, exc_info=True)
  db.session.rollback()
  raise DatasetCreateFailedError()
  return dataset
  