Change blocklist to allowlist for encoding null parameters in `AlgorithmId`.
------------- Commit messages: - the fix Changes: https://git.openjdk.org/jdk/pull/12412/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12412&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8301793 Stats: 193 lines in 2 files changed: 121 ins; 21 del; 51 mod Patch: https://git.openjdk.org/jdk/pull/12412.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12412/head:pull/12412 PR: https://git.openjdk.org/jdk/pull/12412
