No warning message when entering a savage group that will only yield 1 chest

[Subucnimorning]

Untrue - if you've cleared for the week, you aren't allowed to roll on loot if you run it again, regardless of whether or not you got any drops from your first clear.

So I don't even understand why this 0-2 chest system is necessary then? Maybe to prevent 7 people from only taking 1 new person in each time and they are guaranteed the loot?