Cleanup DV example exploiting isolation variables

Follows Analysis!954 (merged), trivial changes.

DaVinciExamples/python/DaVinciExamples/tupling/option_davinci_tupling_relation_isovariables.py

@@ -52,21 +52,21 @@ def main(options: Options):
         'THOR_MASS':
         F.MASS,
         "First_P":
-        F.VALUE_OR(0.) @ F.MAP_INPUT(Functor=F.P, Relations=ftAlg_Rels),
+        F.MAP_INPUT(Functor=F.P, Relations=ftAlg_Rels),
         "First_PT":
-        F.VALUE_OR(0.) @ F.MAP_INPUT(Functor=F.PT, Relations=ftAlg_Rels),
+        F.MAP_INPUT(Functor=F.PT, Relations=ftAlg_Rels),
         "Sum_P":
-        F.VALUE_OR(0.) @ F.SUMCONE(Functor=F.P, Relations=ftAlg_Rels),
+        F.SUMCONE(Functor=F.P, Relations=ftAlg_Rels),
         "Sum_PT":
-        F.VALUE_OR(0.) @ F.SUMCONE(Functor=F.PT, Relations=ftAlg_Rels),
+        F.SUMCONE(Functor=F.PT, Relations=ftAlg_Rels),
         "Max_P":
-        F.VALUE_OR(0.) @ F.MAXCONE(Functor=F.P, Relations=ftAlg_Rels),
+        F.MAXCONE(Functor=F.P, Relations=ftAlg_Rels),
         "Max_PT":
-        F.VALUE_OR(0.) @ F.MAXCONE(Functor=F.PT, Relations=ftAlg_Rels),
+        F.MAXCONE(Functor=F.PT, Relations=ftAlg_Rels),
         "Min_P":
-        F.VALUE_OR(0.) @ F.MINCONE(Functor=F.P, Relations=ftAlg_Rels),
+        F.MINCONE(Functor=F.P, Relations=ftAlg_Rels),
         "Min_PT":
-        F.VALUE_OR(0.) @ F.MINCONE(Functor=F.PT, Relations=ftAlg_Rels),
+        F.MINCONE(Functor=F.PT, Relations=ftAlg_Rels),
         "Asym_P":
         F.ASYM(Functor=F.P, Relations=ftAlg_Rels),
         "Asym_PT":