fix music videos in epg (#166)

ErsatzTV.Core/Iptv/ChannelGuide.cs

@@ -239,6 +239,9 @@ namespace ErsatzTV.Core.Iptv
                 Episode e => e.EpisodeMetadata.HeadOrNone().Match(
                     em => em.Title ?? string.Empty,
                     () => string.Empty),
+                MusicVideo mv => mv.MusicVideoMetadata.HeadOrNone().Match(
+                    mvm => mvm.Title ?? string.Empty,
+                    () => string.Empty),
                 _ => string.Empty
             };
         }

ErsatzTV.Infrastructure/Data/Repositories/ChannelRepository.cs

@@ -74,6 +74,11 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .ThenInclude(i => i.MediaItem)
                 .ThenInclude(i => (i as MusicVideo).MusicVideoMetadata)
                 .ThenInclude(mm => mm.Artwork)
+                .Include(c => c.Playouts)
+                .ThenInclude(p => p.Items)
+                .ThenInclude(i => i.MediaItem)
+                .ThenInclude(i => (i as MusicVideo).Artist)
+                .ThenInclude(a => a.ArtistMetadata)
                 .ToListAsync();
 
         public Task Update(Channel channel)