Cleanup: Modeling: Don't show failed object conversion as incompatible

Previously in b795f09e22 the variable
`incompatible_count` was increased when object conversion failed, this
was not logically correct since the objects type combination is
acceptable compatible, but it's the conversion itself has failed. Do not
increase `incompatible_count` value when this happens, this makes it
consistent with the error message

source/blender/editors/object/object_add.cc

@@ -2465,8 +2465,7 @@ static void make_object_duplilist_real(bContext *C,
   Object *object_eval = DEG_get_evaluated_object(depsgraph, base->object);
 
   if (!(base->object->transflag & OB_DUPLI) &&
-      !bke::object_has_geometry_set_instances(*object_eval))
-  {
+      !bke::object_has_geometry_set_instances(*object_eval)) {
     return;
   }
 
@@ -4068,9 +4067,6 @@ static wmOperatorStatus object_convert_exec(bContext *C, wmOperator *op)
     if (newob) {
       BKE_object_materials_sync_length(bmain, newob, static_cast<ID *>(newob->data));
     }
-    else {
-      incompatible_count++;
-    }
 
     /* tag obdata if it was been changed */