Empty arrays cause errors

[tayloa45]

I've found that an empty array in default.yaml

someParameter: []
anotherParameter: 5

is being transferred to the Swagger file as a null:

x-a127-config:
  someParameter: &someParameter
  anotherParameter: &anotherParameter 5

This is due to lib/loader.js treating empty arrays as simply shorter verisons of non-empty arrays, when in fact Yaml requires them to be explicitly noted as empty using [].

This is causing errors for us as we often use empty arrays as defaults for array-type config values.