BIS-506: Zip file based archiver consistency checks - add toString to VerificationError

SVN: 29872

datastore_server/source/java/ch/systemsx/cisd/openbis/dss/archiveverifier/batch/VerificationError.java

@@ -42,4 +42,11 @@ public class VerificationError
     {
         return this.message;
     }
+
+    @Override
+    public String toString()
+    {
+        return getMessage();
+    }
+
 }