- all Gerber regions (G36 G37) are stored in the '0' aperture

- fixed a bug that added geometry with clear polarity in the apertures where was not supposed to be

FlatCAMObj.py

@@ -359,6 +359,12 @@ class FlatCAMObj(QtCore.QObject):
         except AttributeError:
             pass
 
+        # Not all object types have mark_shapes
+        # try:
+        #     self.mark_shapes.clear(update)
+        # except AttributeError:
+        #     pass
+
     def delete(self):
         # Free resources
         del self.ui