I don't know if/how active you are with Factorio modding right now, but seeing as I love Orphan Finder and not being able to use it under Factorio 2.0 was driving me mad, I've made some minor changes to get your code working again and uploaded a fork for others in the same position, with credit and a link to this mod page.

If you update yours, please let me know and I'll delist the fork.

I was away from the game for almost four years so it was entirely reasonable to consider my mods abandoned.
I have updated most of them now, including this one, but you can keep yours up if you like.

Thank you for liking it enough to fork it :)

Thank you kindly, sir!

I'll go ahead and mark mine as deprecated now; my intention was only to provide a short-term compatability fix until you'd had a chance to update your own version. Thanks again for your efforts and mods.