solved byg 385 by returning null from getWindOnLeg if mark positions are not known;

this will cause a NoWindException in getLegType which is already caught in the wind estimator

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

@@ -161,20 +161,22 @@ public class TrackedLegImpl implements TrackedLeg, RaceChangeListener {
     }
 
     private Wind getWindOnLeg(TimePoint at) {
+        Wind wind;
         Position approximateLegStartPosition = getTrackedRace().getOrCreateTrack(
                 getLeg().getFrom().getBuoys().iterator().next()).getEstimatedPosition(at, false);
         Position approximateLegEndPosition = getTrackedRace().getOrCreateTrack(
                 getLeg().getTo().getBuoys().iterator().next()).getEstimatedPosition(at, false);
         if (approximateLegStartPosition == null || approximateLegEndPosition == null) {
-            throw new RuntimeException("No mark positions received yet for leg "+getLeg()+
+            wind = null;
-                    ". Can't determine wind direction since position is not known.");
+        } else {
+            // exclude track-based estimation; it is itself based on the leg type which is based on the getWindOnLeg
+            // result which
+            // would therefore lead to an endless recursion without further tricks being applied
+            wind = getWind(approximateLegStartPosition.translateGreatCircle(
+                    approximateLegStartPosition.getBearingGreatCircle(approximateLegEndPosition),
+                    approximateLegStartPosition.getDistance(approximateLegEndPosition).scale(0.5)), at,
+                    getTrackedRace().getWindSources(WindSourceType.TRACK_BASED_ESTIMATION));
         }
-        // exclude track-based estimation; it is itself based on the leg type which is based on the getWindOnLeg result which
-        // would therefore lead to an endless recursion without further tricks being applied
-        Wind wind = getWind(
-                approximateLegStartPosition.translateGreatCircle(approximateLegStartPosition.getBearingGreatCircle(approximateLegEndPosition),
-                        approximateLegStartPosition.getDistance(approximateLegEndPosition).scale(0.5)), at,
-                        getTrackedRace().getWindSources(WindSourceType.TRACK_BASED_ESTIMATION));
         return wind;
     }