fix plex scanner crash (#1192)

ErsatzTV.Infrastructure/Data/Repositories/PlexTelevisionRepository.cs

@@ -254,7 +254,11 @@ public class PlexTelevisionRepository : IPlexTelevisionRepository
             // deepScan isn't needed here since we create our own plex etags
             if (plexEpisode.Etag != item.Etag)
             {
-                await UpdateEpisodePath(dbContext, plexEpisode, item);
+                foreach (BaseError error in await UpdateEpisodePath(dbContext, plexEpisode, item))
+                {
+                    return error;
+                }
+
                 result.IsUpdated = true;
             }
 
@@ -465,7 +469,12 @@ public class PlexTelevisionRepository : IPlexTelevisionRepository
         }
     }
 
-    private async Task UpdateEpisodePath(TvContext dbContext, PlexEpisode existing, PlexEpisode incoming)
+    private async Task<Option<BaseError>> UpdateEpisodePath(
+        TvContext dbContext,
+        PlexEpisode existing,
+        PlexEpisode incoming)
+    {
+        try
         {
             // library path is used for search indexing later
             incoming.LibraryPath = existing.LibraryPath;
@@ -493,9 +502,15 @@ public class PlexTelevisionRepository : IPlexTelevisionRepository
 
             file.Path = incomingFile.Path;
 
-        
             await dbContext.Connection.ExecuteAsync(
                 @"UPDATE MediaFile SET Path = @Path WHERE Id = @Id",
                 new { file.Path, file.Id });
+
+            return Option<BaseError>.None;
+        }
+        catch (Exception)
+        {
+            return BaseError.New("Failed to update episode path");
+        }
     }
 }

ErsatzTV.Infrastructure/Plex/PlexServerApiClient.cs

@@ -180,7 +180,7 @@ public class PlexServerApiClient : IPlexServerApiClient
         {
             return xmlService.GetSeasonChildren(seasonMetadataKey, skip, pageSize, token.AuthToken)
                 .Map(r => r.Metadata.Filter(m => m.Media.Count > 0 && m.Media[0].Part.Count > 0))
-                .Map(list => list.Map(metadata => ProjectToEpisode(metadata, library.MediaSourceId)));
+                .Map(list => list.Bind(metadata => ProjectToEpisodes(metadata, library.MediaSourceId)));
         }
 
         return GetPagedLibraryContents(connection, CountItems, GetItems);
@@ -814,9 +814,13 @@ public class PlexServerApiClient : IPlexServerApiClient
         return season;
     }
 
-    private PlexEpisode ProjectToEpisode(PlexXmlMetadataResponse response, int mediaSourceId)
+    private IEnumerable<PlexEpisode> ProjectToEpisodes(PlexXmlMetadataResponse response, int mediaSourceId)
+    {
+        var result = new List<PlexEpisode>();
+
+        // TODO: actually use all media records
+        foreach (PlexMediaResponse<PlexXmlPartResponse> media in response.Media.HeadOrNone())
         {
-        PlexMediaResponse<PlexXmlPartResponse> media = response.Media.Head();
             PlexXmlPartResponse part = media.Part.Head();
             DateTime dateAdded = DateTimeOffset.FromUnixTimeSeconds(response.AddedAt).DateTime;
             DateTime lastWriteTime = DateTimeOffset.FromUnixTimeSeconds(response.UpdatedAt).DateTime;
@@ -852,7 +856,10 @@ public class PlexServerApiClient : IPlexServerApiClient
                 TraktListItems = new List<TraktListItem>()
             };
             
-        return episode;
+            result.Add(episode);
+        }
+
+        return result;
     }
 
     private EpisodeMetadata ProjectToEpisodeMetadata(PlexMetadataResponse response, int mediaSourceId)