Delete at the end of a second level list item before a paragraph creates new empty first level list item

In wiki editor, type:

* foo
** bar

After

edit in wysiwyg, go to the end of bar and hit the delete key. The result will be something like:

* foo
*
** barAfter

This happens because the behavior of the delete is the default browser behavior, which moves the content up but also messes up the inner list, moving it as a child of the first level list. The valid XHTML recovery mechanism transforms this in an empty list item.