hg: code-tools/jcstress: Runners: avoid NPE when auxiliary data is null.

[ashipile at redhat.com]

Changeset: b64aaf61b6be
Author:    shade
Date:      2017-03-08 20:52 +0100
URL:       http://hg.openjdk.java.net/code-tools/jcstress/rev/b64aaf61b6be

Runners: avoid NPE when auxiliary data is null.

! jcstress-core/src/main/java/org/openjdk/jcstress/infra/grading/ReportUtils.java