WialonError constructor Null safety

WialonError(
  1. {int? code,
  2. String? details}
)

Implementation

WialonError({int? code, String? details}) {
  this.code = code;
  if (this._messages[code] != null) {
    this._message = "${this._messages[code]}";
  } else {
    this._message = "${this._messages[-1]}";
  }

  if (details?.isNotEmpty ?? false) {
    this._message += " - ${details}";
  }
}