Fix fetch so that we don't error when no body

Sometimes the response will not contain a body. When this happens an
error is returned from chrome. We should ignore the error and return
nil.

internal/js/modules/k6/browser/common/http.go

@@ -489,6 +489,9 @@ func (r *Response) fetchBody() error {
 	}
 	action := network.GetResponseBody(r.request.requestID)
 	body, err := action.Do(cdp.WithExecutor(r.ctx, r.request.frame.manager.session))
+	if err != nil && strings.Contains(err.Error(), "No data found for resource with given identifier") {
+		return nil
+	}
 	if err != nil {
 		return fmt.Errorf("fetching response body: %w", err)
 	}