OCSP: fix 404 error caused by null extension

Extensions object cannot be constructed with empty Extension.
However, an extension is not required in addResponse function
Corrected the issue by splitting the function between those two cases
Gitlab: #151

Change-Id: I584329ee88457d88198ab3d1457ff41c2b00c40a

jams-ca/src/main/java/net/jami/jams/ca/workers/ocsp/OCSPWorker.java

@@ -162,19 +162,25 @@ public class OCSPWorker extends X509Worker<String> {
             throws OCSPException {
         CertificateID certificateID = request.getCertID();
         // Build Extensions
-        Extensions extensions = new Extensions(new Extension[] {});
         Extensions requestExtensions = request.getSingleRequestExtensions();
         if (requestExtensions != null) {
             Extension nonceExtension =
                     requestExtensions.getExtension(OCSPObjectIdentifiers.id_pkix_ocsp_nonce);
-            if (nonceExtension != null) extensions = new Extensions(nonceExtension);
+            Extensions extensions = new Extensions(nonceExtension);
+            responseBuilder.addResponse(
+                    certificateID,
+                    OCSPCertificateStatusMapper.getStatus(
+                            getCertificateSummary(request.getCertID().getSerialNumber(), unknown)),
+                    new Date(),
+                    new Date(new Date().getTime() + crlLifetime),
+                    extensions);
+        } else {
+            responseBuilder.addResponse(
+                    certificateID,
+                    OCSPCertificateStatusMapper.getStatus(
+                            getCertificateSummary(request.getCertID().getSerialNumber(), unknown)),
+                    new Date(),
+                    new Date(new Date().getTime() + crlLifetime));
         }
-        responseBuilder.addResponse(
-                certificateID,
-                OCSPCertificateStatusMapper.getStatus(
-                        getCertificateSummary(request.getCertID().getSerialNumber(), unknown)),
-                new Date(),
-                new Date(new Date().getTime() + crlLifetime),
-                extensions);
     }
 }