Mentioned in #4593
The error message was (it was trying to access curves from the original mesh instead of dummy curve object):
```
Error: Python: Traceback (most recent call last):
File "\blenderbim\bim\module\geometry\operator.py", line 46, in execute
IfcStore.execute_ifc_operator(self, context)
File "\blenderbim\bim\ifc.py", line 349, in execute_ifc_operator
result = getattr(operator, "_execute")(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\bim\module\geometry\operator.py", line 169, in _execute
core.add_representation(
File "\blenderbim\core\geometry.py", line 52, in add_representation
representation = ifc.run(
^^^^^^^^
File "\blenderbim\tool\ifc.py", line 34, in run
return ifcopenshell.api.run(command, IfcStore.get_file(), **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\__init__.py", line 172, in run
result = usecase_class(ifc_file, **settings).execute()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 73, in execute
return self.create_plan_representation()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 170, in create_plan_representation
return self.create_annotation2d_representation()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 833, in create_annotation2d_representation
items = [self.file.createIfcGeometricCurveSet(self.create_curves(is_2d=True))]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 492, in create_curves
curves = self.create_curves_from_curve_ifc2x3(is_2d=is_2d, curve_object_data=dummy.data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\blenderbim\libs\site\packages\ifcopenshell\api\geometry\add_representation.py", line 575, in create_curves_from_curve_ifc2x3
for spline in self.settings["geometry"].splines:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Mesh' object has no attribute 'splines'
```
Dion Moult