wxGUI/vdigit: fix double click on the line/boundary after activate 'Edit selected line/boundary' editing tool (#1814)

gui/wxpython/vdigit/mapwindow.py

@@ -658,7 +658,8 @@ class VDigitWindow(BufferedMapWindow):
                     else:
                         # unselect
                         self.digit.GetDisplay().SetSelected([])
-                        del self.moveInfo
+                        if hasattr(self, "moveInfo"):
+                            del self.moveInfo
 
                     self.UpdateMap(render=False)