Running any example that has a ScrollPane has root node in the stage leads to this exception.
(likely any Parent without children will have the same problem).

The exception happens here:
AccessibleStage#initialize
        // Note move it to a func later or redo the logic for first , the same is being used when scene graph is modified too
        // Rethink this logic in future
        AccessibleNode dummyRoot = new AccessibleNode(pRoot.getChildrenUnmodifiable().get(0));


The problem is that pRoot has no children.