[BUG] Dart mustache model toJson doesn't handle the situation which the property is object or array

[winterbesos]

openapi-generator/modules/openapi-generator/src/main/resources/dart2/class.mustache

Line 86 in 96bbab9

Map<String, dynamic> toJson() {

If there is a property is an object or an array, it dose not handle this situation.

[mortifactor]

I ran into this problem too. It seems that it has been fixed in dart-dio part of generator: #4401