check tmdb id in fanart provider

MediaBrowser.Providers/Movies/FanArtMovieProvider.cs

@@ -229,16 +229,10 @@ namespace MediaBrowser.Providers.Movies
         {
             cancellationToken.ThrowIfCancellationRequested();
 
-            BaseProviderInfo data;
-
-            if (!item.ProviderData.TryGetValue(Id, out data))
-            {
-                data = new BaseProviderInfo();
-                item.ProviderData[Id] = data;
-            }
-
             var movieId = item.GetProviderId(MetadataProviders.Tmdb);
 
+            if (!string.IsNullOrEmpty(movieId))
+            {
                 var movieDataPath = GetMovieDataPath(ConfigurationManager.ApplicationPaths, movieId);
                 var xmlPath = Path.Combine(movieDataPath, "fanart.xml");
 
@@ -252,6 +246,7 @@ namespace MediaBrowser.Providers.Movies
                 {
                     await FetchFromXml(item, xmlPath, cancellationToken).ConfigureAwait(false);
                 }
+            }
 
             SetLastRefreshed(item, DateTime.UtcNow);
             return true;