Fix TVDB plugin not handling absolute display order

CONTRIBUTORS.md

@@ -57,6 +57,7 @@
  - [Larvitar](https://github.com/Larvitar)
  - [LeoVerto](https://github.com/LeoVerto)
  - [Liggy](https://github.com/Liggy)
+ - [lmaonator](https://github.com/lmaonator)
  - [LogicalPhallacy](https://github.com/LogicalPhallacy)
  - [loli10K](https://github.com/loli10K)
  - [lostmypillow](https://github.com/lostmypillow)

MediaBrowser.Providers/Plugins/TheTvdb/TvdbEpisodeProvider.cs

@@ -154,6 +154,13 @@ namespace MediaBrowser.Providers.Plugins.TheTvdb
                 item.IndexNumber = Convert.ToInt32(episode.DvdEpisodeNumber ?? episode.AiredEpisodeNumber);
                 item.ParentIndexNumber = episode.DvdSeason ?? episode.AiredSeason;
             }
+            else if (string.Equals(id.SeriesDisplayOrder, "absolute", StringComparison.OrdinalIgnoreCase))
+            {
+                if (episode.AbsoluteNumber.GetValueOrDefault() != 0)
+                {
+                    item.IndexNumber = episode.AbsoluteNumber;
+                }
+            }
             else if (episode.AiredEpisodeNumber.HasValue)
             {
                 item.IndexNumber = episode.AiredEpisodeNumber;