toJson method
Implementation
Map<String, dynamic> toJson() {
  final json = _$OpenChannelUpdateParamsToJson(this);
  if (coverImage != null && coverImage!.hasBinary) {
    json['cover_file'] = coverImage;
  } else {
    json['cover_url'] = coverImage?.fileUrl;
  }
  json.removeWhere((key, value) => value == null);
  return json;
}