toJson method
Allows you to serialize object.
Implementation
Map<String, dynamic> toJson() =>
{
"checkOVI": checkOVI,
"checkMLI": checkMLI,
"checkHolo": checkHolo,
"checkED": checkED,
"checkBlackAndWhiteCopy": checkBlackAndWhiteCopy,
"checkDynaprint": checkDynaprint,
}.clearNulls();