API 400 Error responses discard the error description

[matt-deboer]

Opon receiving a 400 Bad Request from the API, it would be useful to keep/propagate the description text as part of the Error type that is returned for troubleshooting purposes.

For example, on a current bad request, the caused by simply includes:

API responded with bad status: 400 Bad Request

but if I print the actual json received, it includes:

{
  "code" : 2,
  "description" : "Bad pipeline description",
  "response" : null
}

which is a bit more useful for troubleshooting...