hg: jdk9/sandbox/jdk: 8165751: NPE hit with java.security.debug=provider

[chris.hegarty at oracle.com]

Changeset: a9fe693da587
Author:    mullan
Date:      2016-12-14 10:22 -0500
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/a9fe693da587

8165751: NPE hit with java.security.debug=provider
Reviewed-by: mullan, weijun
Contributed-by: adam.petcher at oracle.com

! src/java.base/share/classes/java/security/Signature.java
+ test/java/security/Signature/NoProvider.java