Meshing: Debug error caused by index out of range when adding an empty transect on a reach

src/View/Geometry/PlotAC.py

@@ -143,7 +143,7 @@ class PlotAC(PamhyrPlot):
                 ]
             else:
                 color = self.color_incomplete_gl[
-                    lincomplete.index(txt)
+                    lincomplete.index(txt) % len(self.color_incomplete_gl)
                 ]
 
             annotation = self.canvas.axes.annotate(