If we pass null as highlight and shadow color to `BorderFactory.createBevelBorder` and `createSoftBevelBorder` it throws NPE which is not mentioned in the spec as the expected outcome. Fixed the NPE and the spec
------------- Commit messages: - 8370467: BorderFactory.createBevelBorder and createSoftBevelBorder throws NPE for null highlight and shadow Changes: https://git.openjdk.org/jdk/pull/27949/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27949&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8370467 Stats: 69 lines in 2 files changed: 66 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/27949.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/27949/head:pull/27949 PR: https://git.openjdk.org/jdk/pull/27949
