Deleting extra space below table and "unlisting" causes JS error

[Jakub Ś]

Reproducible from CKEditor 3.6.4 rev. [7538]. Can also be reproduced in CKEditor 4.x.

1. Open replacebycode sample and clear editor contents
2. Create 3 level list
3. Click at the end of second list item and insert table
4. There will be space below table and last list item
5. Put cursor in this extra space and press delete
6. Last list item will be joined with second one. Now cursor should be at the beginning of text that previously belonged to last list item.
7. Click list button again

Result: table and taxt that previously belonged to last list item disappears and JS error pops out:
Message: Cannot call method 'getParent' of null
Line: 1608
URI: ckeditor/_source/core/dom/range.js

[Jakub Ś]

Viedo showing how to reproduce