Enable nullable for more files

Jellyfin.Api/Controllers/GenresController.cs

@@ -172,12 +172,9 @@ public class GenresController : BaseJellyfinApiController
 
         item ??= new Genre();
 
-        if (userId.Value.Equals(default))
-        {
-            return _dtoService.GetBaseItemDto(item, dtoOptions);
-        }
-
-        var user = _userManager.GetUserById(userId.Value);
+        var user = userId.Value.Equals(default)
+            ? null
+            : _userManager.GetUserById(userId.Value);
 
         return _dtoService.GetBaseItemDto(item, dtoOptions, user);
     }

MediaBrowser.Controller/Subtitles/ISubtitleManager.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;

MediaBrowser.Providers/Plugins/Tmdb/Movies/TmdbMovieImageProvider.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Globalization;

MediaBrowser.Providers/Plugins/Tmdb/Movies/TmdbMovieProvider.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Globalization;

MediaBrowser.Providers/Plugins/Tmdb/People/TmdbPersonProvider.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Globalization;

MediaBrowser.Providers/Plugins/Tmdb/TV/TmdbEpisodeImageProvider.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Globalization;
@@ -63,7 +61,7 @@ namespace MediaBrowser.Providers.Plugins.Tmdb.TV
 
             var seriesTmdbId = Convert.ToInt32(series?.GetProviderId(MetadataProvider.Tmdb), CultureInfo.InvariantCulture);
 
-            if (seriesTmdbId <= 0)
+            if (series == null || seriesTmdbId <= 0)
             {
                 return Enumerable.Empty<RemoteImageInfo>();
             }

MediaBrowser.Providers/Plugins/Tmdb/TV/TmdbEpisodeProvider.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Globalization;
@@ -87,7 +85,7 @@ namespace MediaBrowser.Providers.Plugins.Tmdb.TV
                 return metadataResult;
             }
 
-            info.SeriesProviderIds.TryGetValue(MetadataProvider.Tmdb.ToString(), out string tmdbId);
+            info.SeriesProviderIds.TryGetValue(MetadataProvider.Tmdb.ToString(), out string? tmdbId);
 
             var seriesTmdbId = Convert.ToInt32(tmdbId, CultureInfo.InvariantCulture);
             if (seriesTmdbId <= 0)

MediaBrowser.Providers/Plugins/Tmdb/TV/TmdbSeriesProvider.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Globalization;

MediaBrowser.Providers/Subtitles/SubtitleManager.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;
@@ -56,7 +54,7 @@ namespace MediaBrowser.Providers.Subtitles
         }
 
         /// <inheritdoc />
-        public event EventHandler<SubtitleDownloadFailureEventArgs> SubtitleDownloadFailure;
+        public event EventHandler<SubtitleDownloadFailureEventArgs>? SubtitleDownloadFailure;
 
         /// <inheritdoc />
         public async Task<RemoteSubtitleInfo[]> SearchSubtitles(SubtitleSearchRequest request, CancellationToken cancellationToken)
@@ -235,7 +233,7 @@ namespace MediaBrowser.Providers.Subtitles
 
         private async Task TrySaveToFiles(Stream stream, List<string> savePaths)
         {
-            List<Exception> exs = null;
+            List<Exception>? exs = null;
 
             foreach (var savePath in savePaths)
             {
@@ -245,7 +243,7 @@ namespace MediaBrowser.Providers.Subtitles
 
                 try
                 {
-                    Directory.CreateDirectory(Path.GetDirectoryName(savePath));
+                    Directory.CreateDirectory(Path.GetDirectoryName(savePath) ?? throw new InvalidOperationException("Path can't be a root directory."));
 
                     var fileOptions = AsyncFile.WriteOptions;
                     fileOptions.Mode = FileMode.CreateNew;

MediaBrowser.Providers/TV/SeriesMetadataService.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System.Collections.Generic;