hg: jdk9/sandbox/jdk: 8172003: getInstance() with unknown provider throws NPE

[chris.hegarty at oracle.com]

Changeset: 96b7fd41b420
Author:    apetcher
Date:      2017-01-04 08:06 -0500
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/96b7fd41b420

8172003: getInstance() with unknown provider throws NPE
Reviewed-by: mullan

! src/java.xml.crypto/share/classes/javax/xml/crypto/dsig/TransformService.java
! src/java.xml.crypto/share/classes/javax/xml/crypto/dsig/XMLSignatureFactory.java
! src/java.xml.crypto/share/classes/javax/xml/crypto/dsig/keyinfo/KeyInfoFactory.java
+ test/javax/xml/crypto/dsig/TransformService/UnknownProvider.java
+ test/javax/xml/crypto/dsig/XMLSignatureFactory/UnknownProvider.java
+ test/javax/xml/crypto/dsig/keyinfo/KeyInfoFactory/UnknownProvider.java