Geometry: Minor fix.

src/View/Geometry/PlotXY.py

@@ -108,6 +108,7 @@ class PlotXY(APlot):
         self.canvas.axes.autoscale()
         self.canvas.figure.tight_layout()
         self.canvas.figure.canvas.draw_idle()
+        if self.toolbar is not None:
             self.toolbar.update()
 
         self._init = True