dependent start time updates now correctly set the race start time and notify listeners appropriately

Change-Id: I3f458c5dabf9da78581e786e35a01bc571d5d4cd

java/com.sap.sailing.server/src/com/sap/sailing/server/masterdata/DummyTrackedRace.java

@@ -448,7 +448,8 @@ public class DummyTrackedRace extends TrackedRaceWithWindEssentials {
     }
 
     @Override
-    public void detachRaceLog(Serializable identifier) {
+    public RaceLog detachRaceLog(Serializable identifier) {
+        return null;
     }
 
     @Override