The call to Core::getGroupPeerNames is expected to return a list where
the index in the list is the group member id. In any error case we were
previously breaking this constraint. It turns out that every time
someone joins a group we call this function before they have a valid
name resulting in their id not being added to the list.
This fix ensures that the list coming out of Core::getGroupPeerNames
always has a full list.
Fixes#5838
fd243738c1