#13 error on mouving command apply on fillet

[Matteo Boscolo]

if you draw a fillet and you try to move it with the move command you get the following error:
Traceback (most recent call last):
File "/home/matteo/Programming/Git/pythoncad/PythonCAD/Interface/Gtk/gtkimage.py", line 518, in __daEvent
event, _tool)
File "/home/matteo/Programming/Git/pythoncad/PythonCAD/Interface/Gtk/gtkmodify.py", line 119, in move_end_button_press_cb
move_objects(gtkimage, _objlist, tool)
File "/home/matteo/Programming/Git/pythoncad/PythonCAD/Interface/Gtk/gtkmodify.py", line 93, in move_objects
PythonCAD.Generic.move.move_objects(objlist, _dx, _dy)
File "/home/matteo/Programming/Git/pythoncad/PythonCAD/Generic/move.py", line 578, in move_objects
_obj._calculateCenter() # FIXME
File "/home/matteo/Programming/Git/pythoncad/PythonCAD/Generic/segjoint.py", line 721, in _calculateCenter
_rc = hypot((_r/tan(_acc)), _r)
TypeError: unsupported operand type(s) for /: 'NoneType' and 'float'