[OOM CERT-SERVICE-CLIENT] Fix null pointer when sans empty2.3.1

Issue-ID: OOM-2632
Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
Change-Id: I5e05eb2923b96313cb1d37eb844862289d6acae1

1 files changed, 2 insertions, 1 deletions

diff --git a/certServiceClient/src/main/java/org/onap/oom/certservice/client/certification/CsrFactory.java b/certServiceClient/src/main/java/org/onap/oom/certservice/client/certification/CsrFactory.java
index 1215e699..4612854d 100644
--- a/certServiceClient/src/main/java/org/onap/oom/certservice/client/certification/CsrFactory.java
+++ b/certServiceClient/src/main/java/org/onap/oom/certservice/client/certification/CsrFactory.java
@@ -34,6 +34,7 @@ import java.util.List;
 import java.util.Optional;
 import java.util.stream.Collectors;
 import javax.security.auth.x500.X500Principal;
+import org.apache.commons.collections.CollectionUtils;
 import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
 import org.bouncycastle.asn1.x509.Extension;
 import org.bouncycastle.asn1.x509.Extensions;
@@ -98,7 +99,7 @@ public class CsrFactory {
         JcaPKCS10CertificationRequestBuilder builder = new JcaPKCS10CertificationRequestBuilder(subject,
             keyPair.getPublic());
 
-        if (!configuration.getSans().isEmpty()) {
+        if (!CollectionUtils.isEmpty(configuration.getSans())) {
             builder.addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest, generateSansExtension());
         }