Fixed: Issue extracting subtitle information for unknown episodes

src/NzbDrone.Core/Extras/Subtitles/ExistingSubtitleImporter.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using NLog;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Core.Extras.Files;
+using NzbDrone.Core.Languages;
 using NzbDrone.Core.MediaFiles.EpisodeImport.Aggregation;
 using NzbDrone.Core.Parser.Model;
 using NzbDrone.Core.Tv;
@@ -78,11 +79,11 @@ namespace NzbDrone.Core.Extras.Subtitles
                                            SeasonNumber = localEpisode.SeasonNumber,
                                            EpisodeFileId = firstEpisode.EpisodeFileId,
                                            RelativePath = series.Path.GetRelativePath(possibleSubtitleFile),
-                                           Language = localEpisode.SubtitleInfo.Language,
-                                           LanguageTags = localEpisode.SubtitleInfo.LanguageTags,
-                                           Title = localEpisode.SubtitleInfo.Title,
+                                           Language = localEpisode.SubtitleInfo?.Language ?? Language.Unknown,
+                                           LanguageTags = localEpisode.SubtitleInfo?.LanguageTags ?? new List<string>(),
+                                           Title = localEpisode.SubtitleInfo?.Title,
                                            Extension = extension,
-                                           Copy = localEpisode.SubtitleInfo.Copy
+                                           Copy = localEpisode.SubtitleInfo?.Copy ?? 0
                                        };
 
                     subtitleFiles.Add(subtitleFile);

src/NzbDrone.Core/MediaFiles/EpisodeImport/Aggregation/Aggregators/AggregateSubtitleInfo.cs

@@ -2,6 +2,7 @@ using System;
 using System.IO;
 using System.Linq;
 using NLog;
+using NzbDrone.Common.Extensions;
 using NzbDrone.Core.Download;
 using NzbDrone.Core.Extras.Subtitles;
 using NzbDrone.Core.Parser;
@@ -30,6 +31,11 @@ namespace NzbDrone.Core.MediaFiles.EpisodeImport.Aggregation.Aggregators
                 return localEpisode;
             }
 
+            if (localEpisode.Episodes.Empty())
+            {
+                return localEpisode;
+            }
+
             var firstEpisode = localEpisode.Episodes.First();
             var episodeFile = firstEpisode.EpisodeFile.Value;
             localEpisode.SubtitleInfo = CleanSubtitleTitleInfo(episodeFile, path);