Enable returning error when configurations in the input data are not in standardized format

Currently binary returns "[]" when configurations in the input data are not in standardized format,
such as

targets:
- paths:
- ./data
policies:
- ./policy

instead of

files:
- paths:
- ./data
policies:
- ./policy

It is recommended to invoke a check loaded configurations from input data against standardized input format and return error when the two are not matching.