core dump with nlohmann::detail::type_error on bad JSON

[pdurbin]

I'm running c53dea4 and I'm getting a core dump when I POST a JSON string to the /provapi/json Python endpoint that it doesn't expect:

client

murphy:~ pdurbin$ cat /tmp/bad.json
{
  "bundle_name": "224-uploadJson",
  "JSON": {
    "entity": {
      "event": {
        "prov:type": "fileUploaded"
      }
    },
    "prefix": {
      "event": {
        "prov": "https://www.w3.org/ns/prov#",
        "rdt": "http://rdatatracker.org/"
      }
    },
    "activity": {
      "p1": {
        "rdt:name": "foo.png",
        "rdt:type": "dataset-42-publish"
      }
    }
  }
}
murphy:~ pdurbin$ curl -i -X POST -H 'Content-type: application/json' http://localhost:7777/provapi/json --upload-file /tmp/bad.json
HTTP/1.1 100 Continue

curl: (52) Empty reply from server
murphy:~ pdurbin$

server

root@ubuntu-xenial:/prov-cpl/bindings/python/RestAPI# su $REST_SERVICE_USER -s /bin/sh -c "python cpl-rest.py --host=0.0.0.0"
 * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
terminate called after throwing an instance of 'nlohmann::detail::type_error'
  what():  [json.exception.type_error.302] type must be string, but is object
Aborted (core dumped)
root@ubuntu-xenial:/prov-cpl/bindings/python/RestAPI#