serveur returns 204 on non existing child node (instead of 404)

[jonenst]

• Do you want to request a feature or report a bug?
  Bug

• What is the current behavior?
  The server returns 204 (Sucess, no content) when getting "fileSystems/{fileSystemName}/nodes/{nodeId}/children/{childName}" and it doesn't exist

• What is the expected behavior?
  It should return a 404

• What is the motivation / use case for changing the behavior?
  Respecting the http status code meanings. This improves API understability and reduce the surprise effect

• Please tell us about your environment:

  • PowSyBl Version: ...
  • OS Version: ...

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, spectrum, etc)

(if a question doesn't apply, you can delete it)

[jonenst]

Also the API is documented in swagger with

@ApiResponse(code = 404, message = "No child node for nodeId")

but actually returns a 204.