watermark property Null safety

AgoraImage? watermark
@JsonKey(includeIfNull: false), read / write

The watermark image added to the CDN live publishing stream. Ensure that the format of the image is PNG. Once a watermark image is added, the audience of the CDN live publishing stream can see it. See AgoraImage.

Implementation

@JsonKey(includeIfNull: false)
AgoraImage? watermark;