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cakephp Tree behavior remove parent node except children
<Node A>
    - child 1 node A
    - child 2 node A
    - child 3 node A
    - <Node B> (which is also a child 4 of Node A)
        - child 1 node B
        - child 2 node B

SELECT * FROM items WHERE left > (parent's left) AND right < (parent's right) AND right = left + 1 AND parent_id = (parent's ID)

$children = <call TreeBehavior children() method with $id = id of Node A and $direct = true>;
$children_without_children = array();
foreach ($children as $child) {
    if (<call TreeBehavior childCount() method with $id = $child->id and $direct = true> === 0) {
        $children_without_children[] = $child;
    }
}

$this->Node->removeFromTree($id, true);