publicPhoto property
publicPhoto User profile photo visible if the main photo is hidden by privacy settings; may be null. If null and user.profile_photo is null, then the photo is empty; otherwise, it is unknown.. If non-null and both photo and personal_photo are null, then it is the same photo as in user.profile_photo and chat.photo. This photo isn't returned in the list of user photos
Implementation
final ChatPhoto? publicPhoto;