improve moviedb null handling

MediaBrowser.Providers/Movies/GenericMovieDbInfo.cs

@@ -194,8 +194,8 @@ namespace MediaBrowser.Providers.Movies
             {
                 var releases = movieData.releases.countries.Where(i => !string.IsNullOrWhiteSpace(i.certification)).ToList();
 
-                var ourRelease = releases.FirstOrDefault(c => c.iso_3166_1.Equals(preferredCountryCode, StringComparison.OrdinalIgnoreCase));
-                var usRelease = releases.FirstOrDefault(c => c.iso_3166_1.Equals("US", StringComparison.OrdinalIgnoreCase));
+                var ourRelease = releases.FirstOrDefault(c => string.Equals(c.iso_3166_1, preferredCountryCode, StringComparison.OrdinalIgnoreCase));
+                var usRelease = releases.FirstOrDefault(c => string.Equals(c.iso_3166_1, "US", StringComparison.OrdinalIgnoreCase));
 
                 if (ourRelease != null)
                 {