Cannot mirror geometry after cut

With the latest master branch, to reproduce the problem,

Create a new geometry
Edit the geometry, and draw a poly line
Then draw a rectangle to cut the poly line
Save the geometry object
Go to double side tool
Enter an arbitrary point, say (0,0), then hit mirror button
Nothing happens, and the console shows

  File "c:\works\pcb\flatcam\code\flatcam\DblSidedTool.py", line 183, in on_mirror
    fcobj.mirror(axis, [px, py])
  File "c:\works\pcb\flatcam\code\flatcam\camlib.py", line 966, in mirror
    xscale, yscale, origin=(px, py))
  File "C:\WinPython-32bit-2.7.10.3\python-2.7.10\lib\site-packages\shapely\affinity.py", line 199, in scale
    return affine_transform(geom, matrix)
  File "C:\WinPython-32bit-2.7.10.3\python-2.7.10\lib\site-packages\shapely\affinity.py", line 46, in affine_transform
    if geom.is_empty:
AttributeError: 'list' object has no attribute 'is_empty'

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