another multi-episode bugfix

ErsatzTV.Core/Scheduling/GroupedMediaItem.cs

@@ -1,7 +1,9 @@
 using System.Collections.Generic;
+using System.Diagnostics;
 using ErsatzTV.Core.Domain;
 
 namespace ErsatzTV.Core.Scheduling
 {
+    [DebuggerDisplay("{First}")]
     public record GroupedMediaItem(MediaItem First, List<MediaItem> Additional);
 }

ErsatzTV.Core/Scheduling/MultiPartEpisodeGrouper.cs

@@ -65,6 +65,11 @@ namespace ErsatzTV.Core.Scheduling
                 }
             }
 
+            if (group != null && lastNumber != 0)
+            {
+                groups.Add(group);
+            }
+
             return groups;
         }