table-ext: an error when trying to make visible not rendered node

I have a tree with the table extension. I call `makeVisible()` method for the node which isn't rendered yet, and its parent node isn't rendered too. The following error occurs:

    Error: Assertion failed
    at Function.jQuery.extend.error (http://localhost:8080/lib/jquery.js:552:9)
    at _assert (http://localhost:8080/src/jquery.fancytree.table.js:26:5)
    at findPrevRowNode (http://localhost:8080/src/jquery.fancytree.table.js:58:3)
    at Object.$.ui.fancytree.registerExtension.nodeRender (http://localhost:8080/src/jquery.fancytree.table.js:170:16)
    at Object.nodeRender (http://localhost:8080/src/jquery.fancytree.js:110:22)
    at Object.Fancytree._callHook (http://localhost:8080/src/jquery.fancytree.js:1707:13)
    at _afterLoad (http://localhost:8080/src/jquery.fancytree.js:3046:9)
    at Object.$.extend.nodeSetExpanded (http://localhost:8080/src/jquery.fancytree.js:3110:4)
    at Object._makeVirtualFunction._super (http://localhost:8080/src/jquery.fancytree.js:100:21)
    at Object.$.ui.fancytree.registerExtension.nodeSetExpanded

`makeVisible()` internally calls `setExpanded` which calls `nodeRender()` in its turn. The last method expects that upper nodes are already rendered. But they aren't because `makeVisible()` expands nodes from bottom to up.