RFR: 8340552: Harden TzdbZoneRulesCompiler against missing zone names

[Florian Weimer]

On Fri, 20 Sep 2024 16:09:13 GMT, Florian Weimer <fweimer at openjdk.org> wrote:

> 8340552: Harden TzdbZoneRulesCompiler against missing zone names

920211592d3 should have the current copyright year.

This isn't really testable because after a refactoring, the error condition this is guarding against can not happen. Upstream time zone data has had links/aliases to zones removed in OpenJDK since basically forever, so every build exercises this code.

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PR Comment: https://git.openjdk.org/jdk/pull/21112#issuecomment-2368643315