Fix react-aspen crashing if an orphaned item is being rendered somehow?

[LoganDark]

Fixes #14

It might be worth investigating how the heck an orphaned item even gets here, but I can't repro it using the demo even using the exact same sequence of inotify events that cause this situation in my application.

[LoganDark]

@NeekSandhu I've manually made this change in my application, and while the error still shows up in console, it no longer breaks the tree view. All functionality seems to be preserved just fine

[zikaari]

@LoganDark Please continue to use the patched version of aspen in your own app until I investigate the root problem. I'd really appreciate it if you can spend some time on coming up with deterministic repro steps (even if that is to forcefully re-render the app 60 times a second like you speculated in the main issue)

[LoganDark]

@LoganDark Please continue to use the patched version of aspen in your own app until I investigate the root problem. I'd really appreciate it if you can spend some time on coming up with deterministic repro steps (even if that is to forcefully re-render the app 60 times a second like you speculated in the main issue)

I did forcefully re-render the app 60 times a second - in the example, that did nothing. I also recreated the exact sequence of inotify events that seemed to cause the problem in my own app. No dice. Combined the two, nothing yet.

So far, I've spent more time trying to find the issue than I did ignoring it.