RFR[12] JDK-8214096: sun.security.util.SignatureUtil passes null parameter, so JCE validation fails

[Valerie Peng]

Any one has time to review this straightforward fix? Details on cause 
and fix is elaborated in the link below:

Bug: https://bugs.openjdk.java.net/browse/JDK-8214096
Webrev can be found at 
http://cr.openjdk.java.net/~valeriep/8214096/webrev.00/

Regards,
Valerie