fromJson static method
Implementation
@visibleForTesting
static DetectFacesBackendException? fromJson(jsonObject) {
  if (jsonObject == null) return null;
  var result = DetectFacesBackendException._privateConstructor();
  result._code = DetectFacesBackendErrorCode.getByValue(jsonObject["code"])!;
  result._message = jsonObject["message"] ?? "";
  return result;
}