Fixed sync-bug when creating new function

Author: stidsborg

Core/Cleipnir.ResilientFunctions/CoreRuntime/Invocation/InvocationHelper.cs

@@ -409,7 +409,7 @@ public Messages CreateMessages(
         ScheduleReInvocation scheduleReInvocation, 
         Func<bool> isWorkflowRunning, 
         Effect effect,
-        IReadOnlyList<StoredMessage> initialMessages)
+        IReadOnlyList<StoredMessage>? initialMessages)
     {
         var messageWriter = new MessageWriter(storedId, _functionStore, Serializer, scheduleReInvocation);
         var registeredTimeouts = new RegisteredTimeouts(storedId, _functionStore.TimeoutStore, effect);

Core/Cleipnir.ResilientFunctions/CoreRuntime/Invocation/Invoker.cs

@@ -238,7 +238,7 @@ await _invocationHelper.PersistFunctionInStore(
                 ScheduleRestart, 
                 isWorkflowRunning: () => !isWorkflowRunningDisposable.Disposed,
                 effect,
-                initialState == null ? [] : _invocationHelper.MapInitialMessages(initialState.Messages)
+                initialState == null ? null : _invocationHelper.MapInitialMessages(initialState.Messages)
             );
 
             var correlations = _invocationHelper.CreateCorrelations(flowId);