Is this a bug, or is there a reason that parentless glyph copies can't remove overlap?

For example:

g = CurrentGlyph()
gCopy = g.copy()
print g, gCopy           # to show these are not None
g.removeOverlap()        # works okay
gCopy.removeOverlap()

Output:

Traceback (most recent call last):
  File "", line 5, in 
  File "lib/fontObjects/robofabWrapper.pyc", line 2128, in removeOverlap
  File "lib/tools/removeOverlap.pyc", line 35, in removeOverlap
  File "lib/fontObjects/doodleBaseGlyph.pyc", line 141, in _get_segmentType
AttributeError: 'NoneType' object has no attribute 'segmentType'

Thanks!

a temporarily workaround could be could be

g = CurrentGlyph()

# create a copy layer and copy the glyph to that layer 
gCopy = g.copyToLayer("copyLayer")

print g, gCopy # to show these are not None
print gCopy.getParent()

g.removeOverlap() # works okay
gCopy.removeOverlap()

(edited your post a bit)