FEM: results, initialize Stats with the appropriate lenght on obj. creation

src/Mod/Fem/feminout/importToolsFem.py

@@ -408,7 +408,9 @@ def fill_femresult_stats(results):
                      npress_min, npress_avg, npress_max]
     # stat_types = ["U1", "U2", "U3", "Uabs", "Sabs", "MaxPrin", "MidPrin", "MinPrin", "MaxShear", "Peeq", "Temp", "MFlow", "NPress"]
     # len(stat_types) == 13*3 == 39
-    # do not forget to adapt the def get_stats in the following code:
+    # do not forget to adapt initialization of all Stats items in modules:
+    # - module femobjects/_FemResultMechanical.py
+    # do not forget to adapt the def get_stats in:
     # - module femresult/resulttools.py
     # - module femtest/testccxtools.py
     # TODO: all stats stuff should be reimplemented, ma be a dictionary would be far more robust than a list

src/Mod/Fem/femobjects/_FemResultMechanical.py

@@ -62,6 +62,10 @@ class _FemResultMechanical():
         obj.addProperty("App::PropertyFloatList", "UserDefined", "NodeData", "User Defined Results", True)
         obj.addProperty("App::PropertyFloatList", "Temperature", "NodeData", "Temperature field", True)
 
+        # initialize the Stats with the appropriate count of items (see fill_femresult_stats in feminout/importToolsFem.py)
+        zero_list = 39 * [0]
+        obj.Stats = zero_list
+
     # standard Feature methods
     def execute(self, obj):
         """"this method is executed on object creation and whenever the document is recomputed"