Handle better messages with not supported type

[pmrt]

• toString should return: not supported.

whatshidden/src/msg/message.js

Lines 137 to 140 in bc13866

	export function extract(msgData) {
	const type = Type[msgData.type];
	return type ? new type(msgData) : new Message(msgData);
	}

toString() doesn't exist in parent < Messages >, so it will throw an error.