RFR: JDK-8267481: Make sure table row has correct number of cells

[Jonathan Gibbons]

On Thu, 20 May 2021 14:38:08 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

> This is a trivial change to throw a NPE or IllegalArgumentException if the number of cells passed to `addRow` does not match the number of column styles. (The non-nullness of `columnStyles` is already implied by other Table methods such as `toContent()`.)

Marked as reviewed by jjg (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4131