message: fix response type error
diff: @@ -563,7 +563,13 @@ export class AjaxMonitor extends BaseTelemetryPlugin implements IDependenciesPlu
  if (_self._config.enableAjaxErrorStatusText && xhr.status >= 400) {
  dependency.properties = dependency.properties || {};
  - dependency.properties.responseText = xhr.statusText + " - " + xhr.responseText;
  + const responseType = xhr.responseType;
  + if (responseType === '' || responseType === 'text') {
  + dependency.properties.responseText = xhr.responseText ? xhr.statusText + " - " + xhr.responseText : xhr.statusText;
  + }
  + if (responseType === 'json') {
  + dependency.properties.responseText = xhr.response ? xhr.statusText + " - " + JSON.stringify(xhr.response) : xhr.statusText;
  + }
  }
  _self.trackDependencyDataInternal(dependency);
  