Export is null on certain conditions

For certain SAML traces it occured to me than the export return an empty file (in fact a file with “null” inside).

An error raises here:

const createFromJSON = function(obj) {
      let stringified = JSON.stringify(obj);
      return JSON.parse(stringified);
    };

    const enrichWithResponse = (req, res) => {
      let responseCopy = createFromJSON(res);
      req.responseStatus = responseCopy.statusCode;
      req.responseStatusText = responseCopy.statusLine;
      req.responseHeaders = responseCopy.responseHeaders;
    };

    let reqscopy = reqs.map(req => {
      let newRequest = createFromJSON(req);
      enrichWithResponse(newRequest, req.getResponse());

      the_filters.forEach(filter => filter(newRequest));
      return newRequest;
    });

When trying to stringify “req.getResponse()” when it returns null.

I wonder if it would be a good solution to alter this:

  'attachHeadersToRequest' : function(request) { // onBeforeSendHeaders
    let uniqueRequestId = new SAMLTrace.UniqueRequestId(request.requestId, request.method, request.url);
    uniqueRequestId.create(id => {
      let tracer = SAMLTrace.TraceWindow.instance();

      // Maybe revise the HTTP method on redirected requests
      let alterationResult = tracer.reviseRedirectedRequestMethod(request, id);
      id = alterationResult.id;

      let entry = tracer.httpRequests.find(req => req.id === id);
      if (!entry) {
        // Skip further execution if no precedingly issued request can be found. This may occur, if tracing
        // new requests is paused. Requests that were issued before pausing will be found and handled.
        return;
      }

      entry.headers = request.requestHeaders;
      tracer.addRequestItem(entry, () => entry.res);
      tracer.updateStatusBar();
    });
  },

In particular: tracer.addRequestItem(entry, () => entry.res); to tracer.addRequestItem(entry, () => entry.res || {}); or so

So the whole trace can be exported dispite one of them acts oddly.