bug6219: no need to invoke compareByBetterScore if no more than one medal race

java/com.sap.sailing.domain/src/com/sap/sailing/domain/leaderboard/ScoringScheme.java

@@ -369,7 +369,7 @@ public interface ScoringScheme extends Serializable {
         int result;
         if (o1MedalRaceScore != null) {
             result = getScoreComparator(nullScoresAreBetter).compare(o1MedalRaceScore, o2MedalRaceScore);
-            if (result == 0) {
+            if (result == 0 && o1ScoringMedalRaces.size() > 1) { // only work calling if more than one scoring medal race
                 result = compareByBetterScore(o1, o1ScoringMedalRaces, o2, o2ScoringMedalRaces,
                         Util.map(o1ScoringMedalRaces, Pair::getA), nullScoresAreBetter, timePoint, leaderboard,
                         discardedRaceColumnsPerCompetitor, totalPointsSupplier, cache);