RFR: 8330702: Update failure handler to don't generate Error message if cores actions are empty

[Serguei Spitsyn]

On Thu, 30 May 2024 02:28:56 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

> The message is generated if cores (or any other tools) section doesn't exist or is empty. However, there is no any tool for cores processing now defined. So ERROR message is generating, confusing users.
> The fix is to don't print error for empty toolset which is the valid case. The message is still generate is tool is not defined to get error message in the case of miswriting.

This looks okay to me.

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Marked as reviewed by sspitsyn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19470#pullrequestreview-2117249931