Draft: Fix Shape2DView finish bug

The Draft_Shape2DView did not finish properly if no object was selected.

Forum topic:
https://forum.freecad.org/viewtopic.php?t=92031

src/Mod/Draft/draftguitools/gui_shape2dview.py

@@ -71,6 +71,11 @@ class Shape2DView(gui_base_original.Modifier):
         else:
             self.proceed()
 
+    def finish(self, cont=False):
+        """Terminate the operation."""
+        self.end_callbacks(self.call)
+        super().finish()
+
     def proceed(self):
         """Proceed with the command if one object was selected."""
         if self.call is not None: