RFR: 6211126: ICC_ColorSpace.toCIEXYZ(float[]): NPE is not specified

[Sergey Bylokhov]

The specification of some methods has been updated to include current behaviour on null.

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Commit messages:
 - tests
 - 6211126: ICC_ColorSpace.toCIEXYZ(float[]): NPE is not specified

Changes: https://git.openjdk.org/jdk/pull/14821/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14821&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6211126
  Stats: 193 lines in 8 files changed: 180 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/14821.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14821/head:pull/14821

PR: https://git.openjdk.org/jdk/pull/14821