Merge pull request #5881 from cvium/tmdb-episode-externalids

Add tvrage and imdb ids for episodes

(cherry picked from commit e19d89bb4f7db97add74dcd601b4c781686f9e7d)
Signed-off-by: Joshua M. Boniface <joshua@boniface.me>

MediaBrowser.Providers/Plugins/Tmdb/TV/TmdbEpisodeProvider.cs

@@ -121,9 +121,20 @@ namespace MediaBrowser.Providers.Plugins.Tmdb.TV
                 CommunityRating = Convert.ToSingle(episodeResult.VoteAverage)
             };
 
-            if (!string.IsNullOrEmpty(episodeResult.ExternalIds?.TvdbId))
+            var externalIds = episodeResult.ExternalIds;
+            if (!string.IsNullOrEmpty(externalIds?.TvdbId))
             {
-                item.SetProviderId(MetadataProvider.Tvdb, episodeResult.ExternalIds.TvdbId);
+                item.SetProviderId(MetadataProvider.Tvdb, externalIds.TvdbId);
+            }
+
+            if (!string.IsNullOrEmpty(externalIds?.ImdbId))
+            {
+                item.SetProviderId(MetadataProvider.Imdb, externalIds.ImdbId);
+            }
+
+            if (!string.IsNullOrEmpty(externalIds?.TvrageId))
+            {
+                item.SetProviderId(MetadataProvider.TvRage, externalIds.TvrageId);
             }
 
             if (episodeResult.Videos?.Results != null)