Avoid null in log statement

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@2228 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/exchange/ews/EwsExchangeSession.java

@@ -553,7 +553,7 @@ public class EwsExchangeSession extends ExchangeSession {
 
     @Override
     public void deleteMessage(ExchangeSession.Message message) throws IOException {
-        LOGGER.debug("Delete " + message.permanentUrl);
+        LOGGER.debug("Delete " + message.imapUid);
         DeleteItemMethod deleteItemMethod = new DeleteItemMethod(((EwsExchangeSession.Message) message).itemId, DeleteType.HardDelete, SendMeetingCancellations.SendToNone);
         executeMethod(deleteItemMethod);
     }