Small fix and formatting AdapterTestUtils

test/java/foundation/pEp/jniadapter/test/utils/AdapterTestUtils.java

@@ -1,4 +1,5 @@
 package foundation.pEp.jniadapter.test.utils;
+
 import foundation.pEp.jniadapter.*;
 
 import java.util.ArrayList;
@@ -274,7 +275,9 @@ public class AdapterTestUtils {
     public static Message makeNewTestMessage(Identity from, Identity to, Message.Direction dir) {
         Message msg = new Message();
         Vector<Identity> vID = new Vector<Identity>();
+        if (to != null) {
             vID.add(to);
+        }
 
         msg.setFrom(from);
         msg.setTo(vID);