Current API responds to invalid JSON with:
```json
HTTP/1.1 400 Bad Request
Content-Type: application/json; charset=UTF-8
...
{"name":"Bad Request","message":"Invalid JSON data in request body: Syntax error.","code":0,"status":400,"previous":{"name":"Internal Server Error","message":"There was an error at the server.","code":0,"status":500}}
```
While it should be
```json
HTTP/1.1 400 Bad Request
Content-Type: application/json; charset=UTF-8
...
{"name":"Bad Request","message":"Invalid JSON data in request body: Syntax error.","code":0,"status":400}
```
