toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (category != null) 'category': category!,
if (code != null) 'code': code!,
if (color != null) 'color': color!,
if (displayName != null) 'displayName': displayName!,
if (indexDescription != null) 'indexDescription': indexDescription!,
if (value != null) 'value': value!,
};