Fix warnings

Author: davidwengier

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Extensions/IServiceCollectionExtensions.cs

@@ -217,6 +217,7 @@ public static void AddDocumentManagementServices(this IServiceCollection service
         {
             services.AddSingleton<IFileChangeDetector, ProjectConfigurationFileChangeDetector>();
         }
+
         services.AddSingleton<IFileChangeDetector, RazorFileChangeDetector>();
 
         // Document processed listeners

src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/MonitorProjectConfigurationFilePathEndpointTest.cs

@@ -1,8 +1,6 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT license. See License.txt in the project root for license information.
 
-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Linq;