Fix nullable issues

Author: IEvangelist

src/ProfanityFilter.Action/Extensions/SummaryExtensions.cs

@@ -53,9 +53,9 @@ internal static Summary AddFilterResultSection(this Summary summary, string sect
             ]),
         ];
 
-        static string ReplaceNewLinesWithHtmlBreaks(string content)
+        static string ReplaceNewLinesWithHtmlBreaks(string? content)
         {
-            return NewLineRegex().Replace(content, "<br>");
+            return NewLineRegex().Replace(content ?? "", "<br>");
         }
 
         foreach (var step in result.Steps ?? [])

src/ProfanityFilter.Action/Models/FilterationResult.cs

@@ -38,13 +38,13 @@ internal readonly record struct FiltrationResult(
     /// Gets the final output of the title.
     /// </summary>
     internal string Title => IsTitleFiltered
-        ? TitleResult.FinalOutput ?? TitleResult.Input
+        ? TitleResult.FinalOutput ?? TitleResult.Input ?? "N/A"
         : "";
 
     /// <summary>
     /// Gets the final output of the body.
     /// </summary>
     internal string Body => IsBodyFiltered
-        ? BodyResult.FinalOutput ?? BodyResult.Input
+        ? BodyResult.FinalOutput ?? BodyResult.Input ?? "N/A"
         : "";
 }

tests/ProfanityFilter.Services.Tests/DefaultProfaneContentFilterServiceTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) David Pine. All rights reserved.
 // Licensed under the MIT License.
 
+using Microsoft.Extensions.Logging.Abstractions;
 using ProfanityFilter.Services.Filters;
 
 namespace ProfanityFilter.Services.Tests;
@@ -11,7 +12,8 @@ public class DefaultProfaneContentFilterServiceTests
     private readonly IProfaneContentFilterService _sut;
 
     public DefaultProfaneContentFilterServiceTests() => _sut = new DefaultProfaneContentFilterService(
-        new MemoryCache(Options.Create<MemoryCacheOptions>(new())));
+        cache: new MemoryCache(Options.Create<MemoryCacheOptions>(new())),
+        logger: NullLogger<DefaultProfaneContentFilterService>.Instance);
 
     [TestMethod]
     [DataRow(null, null)]