Looks like patch is trying to remove an element that doesn't exist

[mrozbarry]

Bug

When adding <li> elements to a <ul>, if I add an empty tag, next update through the system throws an error.

Reproduce it

1. Clone https://github.com/LearnHyperapp/hyper-list , npm install, npm run start
2. http://localhost:8080
3. click the input, hit enter 1x
4. type something in the input box
   What should happen:
   1 empty item in the list, and some input content
   What happens:
   1 empty item, and this exception

Uncaught TypeError: Failed to execute 'removeChild' on 'Node': parameter 1 is not of type 'Node'.
at done (index.js?ee11:214)
at removeElement (index.js?ee11:220)
at patch (index.js?ee11:305)
at patch (index.js?ee11:276)
at patch (index.js?ee11:268)
at render (index.js?ee11:58)

[jorgebucaran]

https://github.com/hyperapp/hyperapp/releases/tag/1.1.2