update episode nfo saving

MediaBrowser.XbmcMetadata/Savers/EpisodeNfoSaver.cs

@@ -64,6 +64,8 @@ namespace MediaBrowser.XbmcMetadata.Savers
                 writer.WriteElementString("aired", episode.PremiereDate.Value.ToLocalTime().ToString(formatString));
             }
 
+            if (!episode.ParentIndexNumber.HasValue || episode.ParentIndexNumber.Value == 0)
+            {
                 if (episode.AirsAfterSeasonNumber.HasValue && episode.AirsAfterSeasonNumber.Value != -1)
                 {
                     writer.WriteElementString("airsafter_season", episode.AirsAfterSeasonNumber.Value.ToString(UsCulture));
@@ -77,8 +79,6 @@ namespace MediaBrowser.XbmcMetadata.Savers
                     writer.WriteElementString("airsbefore_season", episode.AirsBeforeSeasonNumber.Value.ToString(UsCulture));
                 }
 
-            if (episode.ParentIndexNumber.HasValue && episode.ParentIndexNumber.Value == 0)
-            {
                 if (episode.AirsBeforeEpisodeNumber.HasValue && episode.AirsBeforeEpisodeNumber.Value != -1)
                 {
                     writer.WriteElementString("displayepisode", episode.AirsBeforeEpisodeNumber.Value.ToString(UsCulture));