fixed invalidation of start time also for detaching the log and for re-setting the start time

java/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/impl/DynamicTrackedRaceLogListener.java

@@ -47,6 +47,7 @@ public class DynamicTrackedRaceLogListener implements RaceLogEventVisitor {
         // TODO:
         // ??? trackedRace.setStatus(new TrackedRaceStatusImpl(TrackedRaceStatusEnum.PREPARED, 0.0));
         if (raceLog != null) {
+            trackedRace.invalidateStartTime();
             raceLog.removeListener(this);
         }
     }
@@ -80,7 +81,7 @@ public class DynamicTrackedRaceLogListener implements RaceLogEventVisitor {
 
     @Override
     public void visit(RaceLogStartTimeEvent event) {
-        analyzeStatus();
+        trackedRace.invalidateStartTime();
     }
 
     @Override