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https://github.com/IfcOpenShell/IfcOpenShell.git
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39ee9cd8b1
Noticed it was resulting in error below migrating to IFC4X3 in some cases as we don't have a mapping for IFC4X3 yet.
```
if value is None and not attribute.optional():
UnboundLocalError: local variable 'value' referenced before assignment
```
ifcopenshell-python
Python bindings, utility functions, and high-level API for IfcOpenShell.