Tests that tables that have empty-rendered cells during deletion are deleted
correctly.  Empty-rendered cells can be caused by empty cells, cells with
content that has no height, or cells with editable content such that the
content is deleted prior to the table's deletion.

PASS (empty)
PASS (with empty span)
PASS (with editable empty span)
PASS (with editable non-empty span)
PASS (with nested editable non-empty spans)
PASS (with multiple editable non-empty spans)
PASS (with nested table)
PASS (with nested table containing editable non-empty span)