Merge pull request #10062 from lonebyte/m4a-metadata-probing-fix

MediaBrowser.Providers/MediaInfo/AudioFileProber.cs

@@ -222,6 +222,8 @@ namespace MediaBrowser.Providers.MediaInfo
                     var people = new List<PersonInfo>();
                     var albumArtists = tags.AlbumArtists;
                     foreach (var albumArtist in albumArtists)
+                    {
+                        if (!string.IsNullOrEmpty(albumArtist))
                         {
                             PeopleHelper.AddPerson(people, new PersonInfo
                             {
@@ -229,9 +231,12 @@ namespace MediaBrowser.Providers.MediaInfo
                                 Type = PersonKind.AlbumArtist
                             });
                         }
+                    }
 
                     var performers = tags.Performers;
                     foreach (var performer in performers)
+                    {
+                        if (!string.IsNullOrEmpty(performer))
                         {
                             PeopleHelper.AddPerson(people, new PersonInfo
                             {
@@ -239,8 +244,11 @@ namespace MediaBrowser.Providers.MediaInfo
                                 Type = PersonKind.Artist
                             });
                         }
+                    }
 
                     foreach (var composer in tags.Composers)
+                    {
+                        if (!string.IsNullOrEmpty(composer))
                         {
                             PeopleHelper.AddPerson(people, new PersonInfo
                             {
@@ -248,6 +256,7 @@ namespace MediaBrowser.Providers.MediaInfo
                                 Type = PersonKind.Composer
                             });
                         }
+                    }
 
                     _libraryManager.UpdatePeople(audio, people);
                     audio.Artists = performers;