[Term table] Add term should not be suggested when term is already added
V 0.0.6.9.9.4.1 When searching a term, the GarganText display a suggestion to add the term to the map list when it is not found in the current maplist. But the check seems to be limited to groups' labels when it should go inside groups to check that the searched term is not a child of a map term, as in the example below.