Joffrey JAFFEUX 92839dc722 FIX: ensures an empty last message won't cause errors (#23647) ... This would cause an error when deleting the original message of a thread, due to the non existing `last_message`. This fix is implemented using the null pattern. Note this commit is also using this opportunity to unify naming of null objects, `Chat::DeletedUser` becomes `Chat::NullUser`, it feels better to have a name describing what is the object, instead of a name describing why this object has to be used, which can change depending on cases.		2023-09-25 12:43:04 +02:00
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chat	FIX: ensures an empty last message won't cause errors (#23647)	2023-09-25 12:43:04 +02:00