[jdk8u-dev] RFR: 8016451: Scary messages emitted by build.tools.generatenimbus.PainterGenerator during build

[Frederic Thevenet]

Hi,

This is a clean backport of [JDK-8016451: Scary messages emitted by build.tools.generatenimbus.PainterGenerator during build](https://bugs.openjdk.org/browse/JDK-8016451).
Backporting this will eliminate some serious-sounding-yet-innocuous messages from the build logs and reduce the overall amount of noise there.
This will bring OpenJDK to parity with Oracle JDK 8 where it was backported to 8u371. 
This risk is low as the patch is trivial.

Thanks

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Commit messages:
 -  8016451: Scary messages emitted by build.tools.generatenimbus.Painter Generator during build

Changes: https://git.openjdk.org/jdk8u-dev/pull/455/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=455&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8016451
  Stats: 15 lines in 1 file changed: 11 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/455.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/455/head:pull/455

PR: https://git.openjdk.org/jdk8u-dev/pull/455