Removed redundant null check.

dddsample/src/main/java/se/citerus/dddsample/domain/Cargo.java

    */
   public Location lastKnownLocation() {
     HandlingEvent lastEvent = deliveryHistory.lastEvent();
-    
-    if (lastEvent == null) {
-      return Location.UNKNOWN;
-    }
-    
-    
-    
     if (lastEvent != null) {
       return lastEvent.location();
     } else {