Backport pull request #12425 from jellyfin/release-10.9.z

Don't force non-virtual when all episodes in season are isMissing=true

Original-merge: be949af59e550819f68463453dbfb52ea4c01b17

Merged-by: Bond-009 <bond.009@outlook.com>

Backported-by: Joshua M. Boniface <joshua@boniface.me>

MediaBrowser.Providers/TV/SeriesMetadataService.cs

@@ -211,8 +211,12 @@ namespace MediaBrowser.Providers.TV
                 }
                 else if (existingSeason.IsVirtualItem)
                 {
-                    existingSeason.IsVirtualItem = false;
-                    await existingSeason.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, cancellationToken).ConfigureAwait(false);
+                    var episodeCount = seriesChildren.OfType<Episode>().Count(e => e.ParentIndexNumber == seasonNumber && !e.IsMissingEpisode);
+                    if (episodeCount > 0)
+                    {
+                        existingSeason.IsVirtualItem = false;
+                        await existingSeason.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, cancellationToken).ConfigureAwait(false);
+                    }
                 }
             }
         }