<i18n dev> RFR: 8340552: Harden TzdbZoneRulesCompiler against missing zone names

[Florian Weimer]

8340552: Harden TzdbZoneRulesCompiler against missing zone names

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Commit messages:
 - 8340552: Harden TzdbZoneRulesCompiler against missing zone names

Changes: https://git.openjdk.org/jdk/pull/21112/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21112&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340552
  Stats: 11 lines in 1 file changed: 8 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21112.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21112/head:pull/21112

PR: https://git.openjdk.org/jdk/pull/21112