FEM: writer base, change print from error to warning

src/Mod/Fem/femsolver/writerbase.py

@@ -101,15 +101,15 @@ class FemInputWriter():
             elif hasattr(self.mesh_object, "Part"):
                 self.theshape = self.mesh_object.Part
             else:
-                FreeCAD.Console.PrintError(
+                FreeCAD.Console.PrintWarning(
                     "A finite mesh without a link to a Shape was given. "
-                    "Happen on pure mesh objects. Some methods might be broken.\n"
+                    "Happen on pure mesh objects. Not all methods do work without this link.\n"
                 )
             self.femmesh = self.mesh_object.FemMesh
         else:
-            FreeCAD.Console.PrintError(
+            FreeCAD.Console.PrintWarning(
                 "No finite element mesh object was given to the writer class. "
-                "In rare cases this might not be an error. Some methods might be broken.\n"
+                "In rare cases this might not be an error. Not all methods do work without this link.\n"
             )
         self.femnodes_mesh = {}
         self.femelement_table = {}