Ensemble: Add min max dialog for range.

src/Model/Ensembles/Ensemble.py

@@ -31,7 +31,7 @@ class Ensemble(SQLSubModel):
     _sub_classes = []
 
     def __init__(self, id: int = -1, name: str = "",
-                 function=None, range=[],
+                 function=None, range=[0., 100.],
                  data_type=None, target_data=None,
                  status=None, owner_scenario=-1):
         super(Ensemble, self).__init__(