On hash 17d4090d (release/1.7.0 branch at the time of writing).

Steps to reproduce (demo app):

1. Start with empty string in initial-html.js
2. Tap in the "start writing..."
3. Delete the paragraph block
4. Add an image block (no need to select an image though)
5. Delete the image block
6. Red screen:

Steps to reproduce (wpandroid):

1. Start with an empty post
2. Tap in the "start writing..."
3. Delete the paragraph block
4. Add an image block (no need to select an image though)
5. Delete the image block
6. 💥