ValueError: Null TopoDS_Shape object with offset of circle
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bug
OCC kernel issue
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- Python
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Description
```
ellipsis_big = 1
ellipsis_small = 1
s = cq.Sketch().ellipse(ellipsis_big, ellipsis_small).wires().offset(-0.1, mode="s")
```
Any value of ellipsis_small different than 1 will not cause a bug. Using `circle` or `ellipsis_small = ellipsis_big` causes `ValueError: Null TopoDS_Shape object`. Currently I use `0.999` to alleviate the issue.
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