made ORC certificate parsing a bit more tolerant

java/com.sap.sailing.domain.common/src/com/sap/sailing/domain/common/orc/ORCCertificate.java

@@ -117,7 +117,7 @@ public interface ORCCertificate extends WithID, Serializable {
      * The different division intervals are - in contrast to the intervals of the GPH - set by the Offshore Race Committee and not by the national association for a uniform handling.
      * The higher the value, the higher the overall performance, it is measured in meters.
      */
-    double getCDL();
+    Double getCDL();
     
     /**
      * Returns the LOA (length over all) of the {@link Competitor} boat which this certificate belongs to.

java/com.sap.sailing.domain.common/src/com/sap/sailing/domain/common/orc/impl/ORCCertificateImpl.java

@@ -252,7 +252,7 @@ public class ORCCertificateImpl implements ORCCertificate {
     }
 
     @Override
-    public double getCDL() {
+    public Double getCDL() {
         return cdl;
     }