fix xmltv crash with missing episode metadata

ErsatzTV.Application/Television/Mapper.cs

@@ -9,17 +9,17 @@ namespace ErsatzTV.Application.Television
         internal static TelevisionShowViewModel ProjectToViewModel(Show show) =>
             new(
                 show.Id,
-                show.ShowMetadata.HeadOrNone().Map(m => m.Title).IfNone(string.Empty),
+                show.ShowMetadata.HeadOrNone().Map(m => m.Title ?? string.Empty).IfNone(string.Empty),
-                show.ShowMetadata.HeadOrNone().Map(m => m.Year?.ToString()).IfNone(string.Empty),
+                show.ShowMetadata.HeadOrNone().Map(m => m.Year?.ToString() ?? string.Empty).IfNone(string.Empty),
-                show.ShowMetadata.HeadOrNone().Map(m => m.Plot).IfNone(string.Empty),
+                show.ShowMetadata.HeadOrNone().Map(m => m.Plot ?? string.Empty).IfNone(string.Empty),
                 show.ShowMetadata.HeadOrNone().Map(GetPoster).IfNone(string.Empty));
 
         internal static TelevisionSeasonViewModel ProjectToViewModel(Season season) =>
             new(
                 season.Id,
                 season.ShowId,
-                season.Show.ShowMetadata.HeadOrNone().Map(m => m.Title).IfNone(string.Empty),
+                season.Show.ShowMetadata.HeadOrNone().Map(m => m.Title ?? string.Empty).IfNone(string.Empty),
-                season.Show.ShowMetadata.HeadOrNone().Map(m => m.Year?.ToString()).IfNone(string.Empty),
+                season.Show.ShowMetadata.HeadOrNone().Map(m => m.Year?.ToString() ?? string.Empty).IfNone(string.Empty),
                 season.SeasonNumber == 0 ? "Specials" : $"Season {season.SeasonNumber}",
                 season.SeasonMetadata.HeadOrNone().Map(GetPoster).IfNone(string.Empty));
 
@@ -28,8 +28,8 @@ namespace ErsatzTV.Application.Television
                 episode.Season.ShowId,
                 episode.SeasonId,
                 episode.EpisodeNumber,
-                episode.EpisodeMetadata.HeadOrNone().Map(m => m.Title).IfNone(string.Empty),
+                episode.EpisodeMetadata.HeadOrNone().Map(m => m.Title ?? string.Empty).IfNone(string.Empty),
-                episode.EpisodeMetadata.HeadOrNone().Map(m => m.Plot).IfNone(string.Empty),
+                episode.EpisodeMetadata.HeadOrNone().Map(m => m.Plot ?? string.Empty).IfNone(string.Empty),
                 episode.EpisodeMetadata.HeadOrNone().Map(GetThumbnail).IfNone(string.Empty));
 
         private static string GetPoster(Metadata metadata) =>

ErsatzTV.Core/Iptv/ChannelGuide.cs

@@ -62,15 +62,15 @@ namespace ErsatzTV.Core.Iptv
 
                     string title = playoutItem.MediaItem switch
                     {
-                        Movie m => m.MovieMetadata.HeadOrNone().Map(mm => mm.Title).IfNone("[unknown movie]"),
+                        Movie m => m.MovieMetadata.HeadOrNone().Map(mm => mm.Title ?? string.Empty).IfNone("[unknown movie]"),
-                        Episode e => e.EpisodeMetadata.HeadOrNone().Map(em => em.Title).IfNone("[unknown episode]"),
+                        Episode e => e.EpisodeMetadata.HeadOrNone().Map(em => em.Title ?? string.Empty).IfNone("[unknown episode]"),
                         _ => "[unknown]"
                     };
 
                     string description = playoutItem.MediaItem switch
                     {
-                        Movie m => m.MovieMetadata.HeadOrNone().Map(mm => mm.Plot).IfNone(string.Empty),
+                        Movie m => m.MovieMetadata.HeadOrNone().Map(mm => mm.Plot ?? string.Empty).IfNone(string.Empty),
-                        Episode e => e.EpisodeMetadata.HeadOrNone().Map(em => em.Plot).IfNone(string.Empty),
+                        Episode e => e.EpisodeMetadata.HeadOrNone().Map(em => em.Plot ?? string.Empty).IfNone(string.Empty),
                         _ => string.Empty
                     };