Struggling to sweep a circle along a wire

I'm trying to model a set of drawers. These drawers are intended to have a handle on the front, something looking [like this](https://media.rs-online.com/t_large/F7264181-01.jpg).

I've drawn the drawer and put a circle on the face where the handle will meet the drawer. I've then added a curved path over which the circle should be swept. However, I can't make the sweep itself work.

With `handle = handle_circle.sweep(sweep_path)` (full listing below), I get an error saying `BRepFill_Sweep::BuildEdge`. If I add `sweepAlongWires=True`, I get an error saying `Sections must be all closed or all open`.

Can anyone help fix this issue? I'm not finding the error messages tell me what I need to do.

```python
#!/usr/bin/python3
# vim: set fileencoding=utf-8 :
import os
import itertools
import cadquery as cq

obj_list = []

def exportStep(object_list, filename):
"""
Simple worker function to take a list of objects and export a single step file with all objects in place.
"""
vals = list(itertools.chain(*[o.vals() for obj in object_list for o in obj.all()]))
compound = cq.Compound.makeCompound(vals)
compound.exportStep(filename)

drawer_height, drawer_width, drawer_depth, drawer_thickness = 100.0, 300.0, 425.0, 0.8

handle_width = 100.0
handle_diameter = 6.0
handle_depth = 30.0
handle_corner_radius = 10.0

# Draw the drawer (five sides of a cuboid)
drawer = (cq.Workplane('XZ')
.rect(xLen=drawer_width, yLen=drawer_thickness)
.extrude(-drawer_depth)
.faces('>Z').workplane(centerOption='CenterOfBoundBox')
.rect(xLen=drawer_width, yLen=drawer_depth)
.rect(xLen=drawer_width-(2*drawer_thickness), yLen=drawer_depth-(2*drawer_thickness))
.extrude(drawer_height-drawer_thickness)
)

# Draw a circle where the handle meets the drawer
handle_circle = (drawer
.faces('>Y').workplane(centerOption='CenterOfBoundBox')
.moveTo(-handle_width/2.0, 0)
.circle(handle_diameter/2.0)
)
# Draw a path over which we'd like to sweep the circle to make something that looks like a drawer handle
sweep_path = (drawer
.faces('Y').workplane(offset=-(drawer_height/2.0), invert=True, centerOption='CenterOfBoundBox')
.moveTo(handle_width/2.0, 0)
.vLine(-(handle_depth-handle_corner_radius))
.radiusArc(((handle_width/2.0)-handle_corner_radius, -handle_depth), handle_corner_radius)
.hLine(-(handle_width-(2*handle_corner_radius)))
.radiusArc((-handle_width/2.0, -(handle_depth-handle_corner_radius)), handle_corner_radius)
.vLine(handle_depth-handle_corner_radius)
.wire()
)

# Add the drawer, the circle and the sweep path to the objects to be displayed / exported
obj_list.append(drawer)
obj_list.append(handle_circle)
obj_list.append(sweep_path)

# THIS IS WHERE IT GOES WRONG:
# Now try to sweep the circle along the path to make the handle
# If these lines are uncommented, error messages occur!
# handle = handle_circle.sweep(sweep_path)
# obj_list.append(handle)

# If in CQ-Editor GUI:
if 'show_object' in globals():
show_object = globals()['show_object'] # Does nothing, but gets rid of a pylint error
for obj in obj_list:
show_object(obj)
else:
# Otherwise just export the various objects
outname = os.path.splitext(__file__)[0] + ".step"
exportStep(obj_list, outname)
```

Error from the above with the commented out sweep lines put back in:

```
Traceback (most recent call last):
File "drawer_unit_help.py", line 58, in
handle = handle_circle.sweep(sweep_path)
File "c:\applications\development\languages\python\lib\site-packages\cadquery\cq.py", line 2373, in sweep
transition) # returns a Solid (or a compound if there were multiple)
File "c:\applications\development\languages\python\lib\site-packages\cadquery\cq.py", line 2720, in _sweep
isFrenet, transition)
File "c:\applications\development\languages\python\lib\site-packages\cadquery\occ_impl\shapes.py", line 1431, in sweep
builder.Build()
RuntimeError: Standard_ConstructionError
BRepFill_Sweep::BuildEdge
```

Error if I add `sweepAlongWires=True`:

```
Traceback (most recent call last):
File "drawer_unit_help.py", line 58, in
handle = handle_circle.sweep(sweep_path, sweepAlongWires=True)
File "c:\applications\development\languages\python\lib\site-packages\cadquery\cq.py", line 2373, in sweep
transition) # returns a Solid (or a compound if there were multiple)
File "c:\applications\development\languages\python\lib\site-packages\cadquery\cq.py", line 2724, in _sweep
thisObj = Solid.sweep_multi(sections, path.val(), makeSolid, isFrenet)
File "c:\applications\development\languages\python\lib\site-packages\cadquery\occ_impl\shapes.py", line 1463, in sweep_multi
builder.Build()
RuntimeError: Standard_DomainError
Sections must be all closed or all open
```