RFR: 8312246: NPE when HSDB visits bad oop

[Sergey Nazarkin]

Hi!

This is a minor HSDB fix. It prints "bad oop" instead of throwing an NPE message to the console when a corrupted object is found.

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Commit messages:
 - 8312246: NPE when HSDB visits bad oop

Changes: https://git.openjdk.org/jdk/pull/14922/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14922&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312246
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14922.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14922/head:pull/14922

PR: https://git.openjdk.org/jdk/pull/14922