Wp-calypso: After editing uploaded image and editing other image, you get JS error

[lamosty]

While testing #7446, I stumbled upon a JS error. Steps to repro:

1. Go to http://calypso.localhost:3000/post and select a site;
2. Upload new image and click Edit;
3. Click Edit Image in the top right corner;
4. Click Done;
5. Select some other, already uploaded image and click Edit;
6. Click on Edit Image again and then Done;
7. Now, click on Edit in bottom left corner and you'll get the following error:

Full stack trace:

Video:

https://drive.google.com/file/d/0B8e-IpRwSdjteDk2SWdmb28yRUE/view

OS: Ubuntu
Browser: Chrome latest

The problem is that user can't do anything after the error occurs. Can't close the modal, etc. Needs full reload.

cc @gwwar @robobot3000

[retrofox]

@lamosty I can't reproduce it now. Can you take a look when you have the chance please?

[gwwar]

Nice, I think @hoverduck found repro steps in https://github.com/Automattic/wp-calypso/issues/8005

[gwwar]

This was fixed in #8261