[BUG][JavaScript]Timeout unhandled causes crash after PR #1814

Created by: fabik111

Description

With PR #1814 was added in the callApi function an object err to better handle errors. err has four attributes taken from the response obj>

 request.end((error, response) => {
                if (error) {
                    var err = {};
                    err.status = response.status;
                    err.statusText = response.statusText;
                    err.body = response.body;
                    err.response = response;
                    err.error = error;

                    reject(err);

If the call ends with a timeout error, the response obj will be undefined and so I've this problem: TypeError: Cannot read property 'status' of undefined

openapi-generator version

v4.1.3

Related issues/PRs

PR #1814 Line code with bug

Suggest a fix/enhancement

Add a check if response is undefined