PathInteractors not properly deleted when View is closed

When a Side- or TopView is closed the associated PathInteractor lingers and throws nasty errors to the console. The error can be reproduced most easily by creating a Top&SideView, deleting the SideView and then moving a Waypoint. Result:

Traceback (most recent call last):
  File "C:\Users\icg173\src\mss.perf2\mslib\msui\mpl_pathinteractor.py", line 771, in qt_data_changed_listener
    self.redraw_figure()
  File "C:\Users\icg173\src\mss.perf2\mslib\msui\mpl_pathinteractor.py", line 693, in redraw_figure
    self.redraw_path()
  File "C:\Users\icg173\src\mss.perf2\mslib\msui\mpl_pathinteractor.py", line 608, in redraw_path
    self.canvas.blit(self.ax.bbox)
  File "C:\Users\icg173\Anaconda\lib\site-packages\matplotlib\backends\backend_qt5agg.py", line 200, in blit
    self.repaint(l, self.renderer.height-t, w, h)
RuntimeError: wrapped C/C++ object of type MplSideViewCanvas has been deleted

The PathInteractor is connected to the WayPointTable using a QT connect command. Disconnecting this might do the trick... I could not easily find out how this might be achieved from the perspective of the Class that actually knows that it is being closed.

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