Adding a null check for routingFeature. (#10933)

* Adding a null check for routingFeature.

Author: RohitRanjanMS

src/WebJobs.Script/Diagnostics/OpenTelemetry/OpenTelemetryConfigurationExtensions.cs

@@ -94,14 +94,19 @@ private static IOpenTelemetryBuilder ConfigureTracing(this IOpenTelemetryBuilder
                 {
                     o.EnrichWithHttpResponse = (activity, httpResponse) =>
                     {
-                        if (Activity.Current != null)
+                        if (Activity.Current is not null)
                         {
-                            var routingFeature = httpResponse.HttpContext.Features.Get<AspNetCore.Routing.IRoutingFeature>();
-                            var template = routingFeature.RouteData.Routers.FirstOrDefault(r => r is Route) as Route;
+                            Activity.Current.AddTag(ResourceSemanticConventions.FaaSTrigger, OpenTelemetryConstants.HttpTriggerType);
+
+                            var routingFeature = httpResponse.HttpContext.Features.Get<IRoutingFeature>();
+                            if (routingFeature is null)
+                            {
+                                return;
+                            }
 
+                            var template = routingFeature.RouteData.Routers.FirstOrDefault(r => r is Route) as Route;
                             Activity.Current.DisplayName = $"{Activity.Current.DisplayName} {template?.RouteTemplate}";
                             Activity.Current.AddTag(ResourceSemanticConventions.HttpRoute, template?.RouteTemplate);
-                            Activity.Current.AddTag(ResourceSemanticConventions.FaaSTrigger, OpenTelemetryConstants.HttpTriggerType);
                         }
                     };
                 });