allow to make timestamp only signature "LTV"

### Eclipse Workspace Patch 1.0
#P pdfbox
Index: examples/src/main/java/org/apache/pdfbox/examples/signature/validation/AddValidationInformation.java
===================================================================
--- examples/src/main/java/org/apache/pdfbox/examples/signature/validation/AddValidationInformation.java (revision 1885032)
+++ examples/src/main/java/org/apache/pdfbox/examples/signature/validation/AddValidationInformation.java (working copy)
@@ -30,6 +30,7 @@
 import java.security.cert.X509CRL;
 import java.security.cert.X509Certificate;
 import java.util.Calendar;
+import java.util.Date;
 import java.util.HashSet;
 import java.util.Set;
 
@@ -355,9 +356,15 @@
 // This certificate has been OCSP-checked before
 return;
 }
- OcspHelper ocspHelper = new OcspHelper(
+ Date time = null;
+ if (null == signDate) {
+ time = new Date(); //should rather take timestampTime
+ } else {
+ time = signDate.getTime();
+ }
+ OcspHelper ocspHelper = new OcspHelper(
 certInfo.getCertificate(),
- signDate.getTime(),
+ time,
 certInfo.getIssuerCertificate(),
 new HashSet<>(certInformationHelper.getCertificateSet()),
 certInfo.getOcspUrl());