cubicweb-collaboration #4354560 Collaboration tree should not be visible until there is info in it [open]

When there is no clone of a displayed collaborative entity and it is not a clone of another one, there is no information at all in the tree. We should not display it under such condition IMHO.

A way to implement this is to complement its selector with something like

(has_related_entities('clone_of', role='subject') | has_related_entities('clone_of', role='object'))

Note such a behaviour must be tested.

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