New code exposing ID Pointers CustomProperties to the UI (b3c7f3c8a9)
would cause invalid data access when calling `as_dict()` on py-defined ID
pointers ID properties, since these have no ID type defined by default.
The code of `as_dict()` will now forcefully generate a valid ID type
value, either by using the type of the currently assigned ID, or falling
back to the Object ID type.
Found while opening some lighting production files from the Pets
Project.
445fabeae9