Destroyed modal still listens on keyup event

[luksurious]

Versions
BulmaJS: 0.10.0
Browser: Any (Chrome/Firefox(
Operating system: Linux/Windows

Describe the bug
When a modal is destroyed the key event listener is not removed. Thus, if a key is typed afterwards on the page a JS error is raised because of the elements in the listener not existing anymore: modal.js:193 Uncaught TypeError: Cannot read property 'classList' of null

To Reproduce
Steps to reproduce the behavior:

1. Go to https://jsfiddle.net/2wtkp783/
2. Click on "Open Modal" to make sure a valid modal is created
3. Close modal
4. Click on "Destroy Modal"
5. Type something in the text box below
6. Observe JS error in browser console

Expected behavior
No error should be raised. The event listener should be removed on destroy.

Screenshots

[VizuaaLOG]

Reopening and a reminder to port this back to 0.10.