cubicweb-collaboration #3850973 should not be able to remove a collaborator if she owns a clone [validation pending]

missing some permissions on collaborates_on relation.

prioritynormal
typeenhancement
done in1.0.0
load0.500
load left0.000
closed by#8eb7bccd2bf1 Prevent collaborators with a clone to be removed from the collaborators list
patchPrevent collaborators with a clone to be removed from the collaborators list [applied]