Fix RevocationChecker IndexOutOfBoundsException

Ported from openJdk8u121

Failed to locate referenced test.

port from openjdk8u121
changeset:   9171:0157177fb61a
user:        juh
date:        Wed Feb 19 20:07:10 2014 -0800
summary:     8031025: SQE test CertPath/CertPathBuilderTest/* failed with java.lang.IndexOutOfBoundsException

Test: CtsLibcoreTestCases
Bug: 31028374
Change-Id: Ie5fa22cd3b90c6026c6efd6db1d179d5d1cd6eb9
diff --git a/ojluni/src/main/java/sun/security/provider/certpath/RevocationChecker.java b/ojluni/src/main/java/sun/security/provider/certpath/RevocationChecker.java
index 19b41f6..f38e7dc 100644
--- a/ojluni/src/main/java/sun/security/provider/certpath/RevocationChecker.java
+++ b/ojluni/src/main/java/sun/security/provider/certpath/RevocationChecker.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1035,6 +1035,9 @@
                 boolean signFlag = true;
                 List<? extends Certificate> cpList =
                     cpbr.getCertPath().getCertificates();
+                if (cpList.isEmpty()) {
+                    return;
+                }
                 try {
                     for (int i = cpList.size()-1; i >= 0; i-- ) {
                         X509Certificate cert = (X509Certificate)cpList.get(i);