Handle null EventData in PublishEventAsync

src/apps/Caspian.WorkflowFramework/Services/WorkflowService.cs

@@ -4,6 +4,7 @@ using System.Diagnostics;
 using System.Dynamic;
 using System.Linq;
 using System.Text;
+using System.Text.Json;
 using System.Threading.Tasks;
 using Azure;
 using Caspian.WorkflowFramework.Contracts;
@@ -168,6 +169,11 @@ public class WorkflowService : IWorkflowService, ILoggable
                 return response;
             }
 
+            dynamic payload = null;
+
+            if (input.EventData.ValueKind != JsonValueKind.Undefined &&
+                input.EventData.ValueKind != JsonValueKind.Null)
+            {
                 var json = input.EventData.GetRawText();
 
                 var settings = new JsonSerializerSettings
@@ -176,7 +182,8 @@ public class WorkflowService : IWorkflowService, ILoggable
                 };
 
                 // تبدیل JSON به object داینامیک
-            dynamic payload = JsonConvert.DeserializeObject<ExpandoObject>(json, settings);
+                payload = JsonConvert.DeserializeObject<ExpandoObject>(json, settings);
+            }
 
             //await _eventPublisher.PublishAsync(input.EventName, null, input.WorkflowInstanceId, null, input.EventData, asynchronous: true);
             await _eventPublisher.PublishAsync(input.EventName, null, input.WorkflowInstanceId, null, payload);