POST empty body request - 500 in @4.2.1

[losikov]

Describe the bug
POST request with empty body. Expect to get 415 status code, and response body set in server.use((err, req, res, next) => {})
The issue is for 4.2.1, works as expected in 4.2.0.

To Reproduce

import request from 'supertest'
...
  it('should return 415 to a omitted request body', done => {
    request(server)
      .post('/api/v1/users/login')
      .set('Accept', 'application/json')
      .expect('Content-Type', /json/)
      .expect(415)
      .end(function(err, res) {
        console.log(res.body)
        if (err) return done(err)
        done()
      })
  })

Actual behavior
Statuc code: 500
Content-Type: text/html; charset=utf-8
Body: {}

Expected behavior
Statuc code: 415
Content-Type: application/json
Body: set in server.use((err, req, res, next) => {})

[cdimascio]

@losikov thanks for the issue. Will have a look

[cdimascio]

This PR is the likely culprit. Feel free to have a look
#398

[cdimascio]

@losikov fixed in4.2.2