Apparently not all ViewProviders has a Proxy (Python)

[mnesarco]

See: https://forum.freecad.org/viewtopic.php?t=86414&start=30#p761069

>>> create_placementSheet()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/wrosner/.local/share/FreeCAD/Macro/fcapi/examples/test_spreadsheet.py", line 61, in create_placementSheet
    return MyPlacementSheet.create(name="PlacementSheet")
  File "/home/wrosner/.local/share/FreeCAD/Macro/fcapi/fpo.py", line 1169, in create
    fp.ViewObject.Proxy = 0
AttributeError: 'SpreadsheetGui.ViewProviderSheet' object has no attribute 'Proxy'