Possible to not serialize null?

[felixgabler]

Since the models use json_serializable, I was wondering whether we could make it possible to disable the behavior where null values are included in the JSON.

https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonKey/includeIfNull.html

This would keep the database smaller since there are often quite a few null values (e.g. most of the author)

[demchenkoalex]

Hmm interesting suggestion, I will read more about that. Thanks!

[felixgabler]

This would be the changes necessary: flyerhq/flutter_chat_types#18

[demchenkoalex]

Thanks. Merged :)