Can't build an Infinite Supply Node

[ryanjjung]

If you try, you get this stacktrace:

Traceback (most recent call last):
  File "/home/ryan/workspace/ryanjjung/satisfactor-py/factory_designer_gtk/main_window.py", line 1562, in __btnBuild_clicked
    self.update_window()
  File "/home/ryan/workspace/ryanjjung/satisfactor-py/factory_designer_gtk/main_window.py", line 635, in update_window
    self.update_component_context(skip=skip)
  File "/home/ryan/workspace/ryanjjung/satisfactor-py/factory_designer_gtk/main_window.py", line 412, in update_component_context
    current_item = c.item.programmatic_name()
                   ^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'programmatic_name'