RFR: 8301793: AlgorithmId should not encode a missing parameters field as NULL unless hardcoded [v2]

[Weijun Wang]

> Change blocklist to allowlist for encoding null parameters in `AlgorithmId`.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  unexpected

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12412/files
  - new: https://git.openjdk.org/jdk/pull/12412/files/d2fd2048..f6f676c0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12412&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12412&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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