Add protection for the bdtScore on TOB-based eTau RoIs
On TOB-based eFexTauRoI objects, the bdtScore returns the energy. This MR adds a protection to avoid confusion, so it returns 0 instead.
On TOB-based eFexTauRoI objects, the bdtScore returns the energy. This MR adds a protection to avoid confusion, so it returns 0 instead.