[jdk17u-dev] RFR: 8305505: NPE in javazic compiler

[Goetz Lindenmaier]

I backport this for parity with 17.0.10-oracle.

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Commit messages:
 - Backport 544bd260b6eb7bc7cf79a3739cc94bad658d7d15

Changes: https://git.openjdk.org/jdk17u-dev/pull/1834/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1834&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305505
  Stats: 5 lines in 1 file changed: 1 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1834.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1834/head:pull/1834

PR: https://git.openjdk.org/jdk17u-dev/pull/1834