Add HttpRequestData null handling (#2786)

Add HttpRequestData null handling in CreateCheckStatusResponse.

Author: jaliyaudagedara

src/Worker.Extensions.DurableTask/DurableTaskClientExtensions.cs

@@ -56,6 +56,11 @@ public static async Task<HttpResponseData> CreateCheckStatusResponseAsync(
             throw new ArgumentNullException(nameof(client));
         }
 
+        if (request is null)
+        {
+            throw new ArgumentNullException(nameof(request));
+        }
+
         HttpResponseData response = request.CreateResponse(statusCode);
         object payload = SetHeadersAndGetPayload(client, request, response, instanceId);
 
@@ -102,6 +107,11 @@ public static HttpResponseData CreateCheckStatusResponse(
             throw new ArgumentNullException(nameof(client));
         }
 
+        if (request is null)
+        {
+            throw new ArgumentNullException(nameof(request));
+        }
+
         HttpResponseData response = request.CreateResponse(statusCode);
         object payload = SetHeadersAndGetPayload(client, request, response, instanceId);