IfcCurveBoundedPlane is not created property when inner boundaries are not present

[zf-autodesk]

There is an issue with IfcCurveBoundedPlane where if there if there are no internal boundaries, the file is showing it is internal boundaries as a null instead of an empty set. Null cannot show up in many IFC viewers such as Blender and it will also fail the IFC Validation

Original Creation:
#44= IFCCURVEBOUNDEDPLANE(#43,#40,$);

After modifying to:
#44= IFCCURVEBOUNDEDPLANE(#43,#40,());

The plane showed up and passed the validation as well.