RFR: 8341281: Root TreeItem with null value breaks TreeTableView

[Kevin Rushforth]

On Wed, 16 Apr 2025 16:49:44 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> When the Root TreeItem is set to null, need to relayout to show the children items
>
> if you merge the latest `master` branch it'll get rid of the build error on windows.

Reviewers: @andy-goryachev-oracle @arapte

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PR Comment: https://git.openjdk.org/jfx/pull/1767#issuecomment-2835282054