[jdk11u-dev] RFR: 8318971: Better Error Handling for Jar Tool When Processing Non-existent Files

[Goetz Lindenmaier]

I backport this for parity with 11.0.23-oracle.

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Commit messages:
 - Backport 8ae309ebacd6947bbad2ef168ca13702e1cba099

Changes: https://git.openjdk.org/jdk11u-dev/pull/2484/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2484&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318971
  Stats: 86 lines in 2 files changed: 84 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2484.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2484/head:pull/2484

PR: https://git.openjdk.org/jdk11u-dev/pull/2484