When removing character(s) from the first element in an unordered list, the <ul> tags are removed as well. Verified only on eZ Publish 4.7, on all tested browsers (IE11, Chrome 30, FF 24).

Steps to reproduce:

On a clean, fully patched installation of eZ Publish 4.7,

1. Create an article;
2. On an XML block field - e.g. Body - click the "Unordered list" button;
3. Add a few list items - any number will do, even one;
4. Place cursor anywhere on first list item and hit backspace. The <ul> tags will be removed.