[graphics] Error with "set_as_default" flag in python

[godardma]

From the tutorial:

The python line :

fig = Figure2D("My figure", GraphicOutput.VIBES | GraphicOutput.IPE, True)

raises an Error :

fig = Figure2D("My_figure", GraphicOutput.VIBES | GraphicOutput.IPE, True)
RuntimeError: bad_weak_ptr