fix C# codegen for empty service
diff --git a/src/csharp/Grpc.IntegrationTesting/WorkerServiceGrpc.cs b/src/csharp/Grpc.IntegrationTesting/WorkerServiceGrpc.cs
index ede3ace..85f2cfd 100644
--- a/src/csharp/Grpc.IntegrationTesting/WorkerServiceGrpc.cs
+++ b/src/csharp/Grpc.IntegrationTesting/WorkerServiceGrpc.cs
@@ -19,7 +19,7 @@
//
// An integration test service that covers all the method signature permutations
// of unary/streaming requests/responses.
-#pragma warning disable 1591
+#pragma warning disable 0414, 1591
#region Designer generated code
using grpc = global::Grpc.Core;