RFR: JDK-8323543: NPE when table items are set to null [v6]

[Andy Goryachev]

On Sun, 14 Jan 2024 16:06:42 GMT, Carl Döbbelin <duke at openjdk.org> wrote:

>> This PR fixes a nullpointer in TableSkinUtils that occured when the Tables items were null.
>
> Carl Döbbelin has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
> 
>   JDK-8323543: change tests to JUnit4 for compatibility

backport instructions:
https://openjdk.org/guide/#working-with-backports-in-jbs

@kevinrushforth there is still time to backport, right?

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PR Comment: https://git.openjdk.org/jfx/pull/1329#issuecomment-1896049195