fix: Adding waypoints to GUI after calculating a route leads to error

Author: merydian

ORStools/gui/ORStoolsDialog.py

@@ -675,6 +675,7 @@ def _on_linetool_map_doubleclick(self) -> None:
         self.line_tool.doubleClicked.disconnect()
         QApplication.restoreOverrideCursor()
         self._iface.mapCanvas().setMapTool(self.last_maptool)
+        self.line_tool = None
         self.show()
 
     def color_duplicate_items(self, list_widget):