hg: jdk9/dev/jaxp: 8150187: NPE expected if the system identifier is null for CatalogResolver

[huizhe.wang at oracle.com]

Changeset: f8899b1884e2
Author:    joehw
Date:      2016-06-03 11:38 -0700
URL:       http://hg.openjdk.java.net/jdk9/dev/jaxp/rev/f8899b1884e2

8150187: NPE expected if the system identifier is null for CatalogResolver
Reviewed-by: rriggs, lancea

! src/java.xml/share/classes/javax/xml/catalog/CatalogResolverImpl.java
! test/javax/xml/jaxp/libs/catalog/ResolutionChecker.java
! test/javax/xml/jaxp/unittest/catalog/CatalogTest.java