Fixing NPE when de-serializing start of tracking race log event with null start of tracking time

java/com.sap.sailing.server.gateway.serialization.shared.android/src/com/sap/sailing/server/gateway/deserialization/racelog/impl/BaseRaceLogEventDeserializer.java

@@ -61,7 +61,7 @@ public abstract class BaseRaceLogEventDeserializer implements JsonDeserializer<R
                 Helpers.tryUuidConversion(id),
                 new MillisecondsTimePoint(createdAt.longValue()),
                 author, 
-                new MillisecondsTimePoint(timeStamp.longValue()),
+                timeStamp == null ? null : new MillisecondsTimePoint(timeStamp.longValue()),
                 passId.intValue(), competitors);
     }