Fem: Save empy mesh if last step is AnalyzeGeometry in Netgen mesher

src/Mod/Fem/femmesh/netgentools.py

@@ -131,6 +131,19 @@ NetgenTools.run_netgen(**{params})
                 geom.Heal()
             mesh = geom.GenerateMesh(mp=meshing.MeshingParameters(**params))
 
+        result = {
+            "coords": [],
+            "Edges": [[], []],
+            "Faces": [[], []],
+            "Volumes": [[], []],
+        }
+        groups = {"Edges": [], "Faces": [], "Solids": []}
+
+        # save empty data if last step is geometry analysis
+        if params["perfstepsend"] == NetgenTools.meshing_step["AnalizeGeometry"]:
+            np.save(result_file, [result, groups])
+            return None
+
         if second_order:
             mesh.SecondOrder()
 
@@ -175,7 +188,6 @@ NetgenTools.run_netgen(**{params})
         idx_faces = faces["index"]
         idx_volumes = volumes["index"]
 
-        groups = {"Edges": [], "Faces": [], "Solids": []}
         for i in np.unique(idx_edges):
             edge_i = (np.nonzero(idx_edges == i)[0] + 1).tolist()
             groups["Edges"].append([i, edge_i])