Sketch hull failure due to overlapping geometries

## To Reproduce

```
import cadquery as cq
from cadquery.vis import show

sketch = (cq.Sketch()
.push([(44,0)])
.rect(40, 40)
.reset()
.push([(82, 0)])
.circle(20)
.reset()
.hull())

show(sketch)
```
Running the above code will result in the following error:

## How to fix

Applying #1889 pull request will fix the sketch hull failure.