[OpenJDK 2D-Dev] RFR: 8263439: getSupportedAttributeValues() throws NPE for Finishings attribute

[Phil Race]

This seems to be a code path that has has not been exercised.
We need to check for null values in the array.

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Commit messages:
 - 8263439: getSupportedAttributeValues() throws NPE for Finishings attribute

Changes: https://git.openjdk.java.net/jdk/pull/3055/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3055&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263439
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3055.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3055/head:pull/3055

PR: https://git.openjdk.java.net/jdk/pull/3055