Fixed: Prevent NullRef on Manual Import of unknown releases

src/NzbDrone.Core/Download/CompletedDownloadService.cs

@@ -123,7 +123,7 @@ namespace NzbDrone.Core.Download
             if (allTracksImported)
             {
                 trackedDownload.State = TrackedDownloadState.Imported;
-                _eventAggregator.PublishEvent(new DownloadCompletedEvent(trackedDownload));
+                _eventAggregator.PublishEvent(new DownloadCompletedEvent(trackedDownload, trackedDownload.RemoteAlbum.Artist.Id));
                 return;
             }
 
@@ -141,7 +141,7 @@ namespace NzbDrone.Core.Download
                 if (allTracksImportedInHistory)
                 {
                     trackedDownload.State = TrackedDownloadState.Imported;
-                    _eventAggregator.PublishEvent(new DownloadCompletedEvent(trackedDownload));
+                    _eventAggregator.PublishEvent(new DownloadCompletedEvent(trackedDownload, trackedDownload.RemoteAlbum.Artist.Id));
                     return;
                 }
             }

src/NzbDrone.Core/Download/DownloadCompletedEvent.cs

@@ -1,4 +1,4 @@
-using NzbDrone.Common.Messaging;
+using NzbDrone.Common.Messaging;
 using NzbDrone.Core.Download.TrackedDownloads;
 
 namespace NzbDrone.Core.Download
@@ -6,10 +6,12 @@ namespace NzbDrone.Core.Download
     public class DownloadCompletedEvent : IEvent
     {
         public TrackedDownload TrackedDownload { get; private set; }
+        public int ArtistId { get; set; }
 
-        public DownloadCompletedEvent(TrackedDownload trackedDownload)
+        public DownloadCompletedEvent(TrackedDownload trackedDownload, int artistId)
         {
             TrackedDownload = trackedDownload;
+            ArtistId = artistId;
         }
     }
 }

src/NzbDrone.Core/MediaFiles/TrackImport/Manual/ManualImportService.cs

@@ -370,6 +370,7 @@ namespace NzbDrone.Core.MediaFiles.TrackImport.Manual
             foreach (var groupedTrackedDownload in importedTrackedDownload.GroupBy(i => i.TrackedDownload.DownloadItem.DownloadId).ToList())
             {
                 var trackedDownload = groupedTrackedDownload.First().TrackedDownload;
+                var importArtist = groupedTrackedDownload.First().ImportResult.ImportDecision.Item.Artist;
 
                 var outputPath = trackedDownload.ImportItem.OutputPath.FullPath;
 
@@ -377,7 +378,7 @@ namespace NzbDrone.Core.MediaFiles.TrackImport.Manual
                 {
                     if (_downloadedTracksImportService.ShouldDeleteFolder(
                             _diskProvider.GetDirectoryInfo(outputPath),
-                            trackedDownload.RemoteAlbum.Artist) && trackedDownload.DownloadItem.CanMoveFiles)
+                            importArtist) && trackedDownload.DownloadItem.CanMoveFiles)
                     {
                         _diskProvider.DeleteFolder(outputPath, true);
                     }
@@ -386,7 +387,7 @@ namespace NzbDrone.Core.MediaFiles.TrackImport.Manual
                 if (groupedTrackedDownload.Select(c => c.ImportResult).Count(c => c.Result == ImportResultType.Imported) >= Math.Max(1, trackedDownload.RemoteAlbum.Albums.Count))
                 {
                     trackedDownload.State = TrackedDownloadState.Imported;
-                    _eventAggregator.PublishEvent(new DownloadCompletedEvent(trackedDownload));
+                    _eventAggregator.PublishEvent(new DownloadCompletedEvent(trackedDownload, importArtist.Id));
                 }
             }
         }