update connect error responses

Emby.Server.Implementations/Connect/ConnectManager.cs

@@ -570,9 +570,9 @@ namespace Emby.Server.Implementations.Connect
             }
             catch (HttpException ex)
             {
-                if (!ex.StatusCode.HasValue)
+                if (!ex.StatusCode.HasValue || ex.IsTimedOut)
                 {
-                    throw;
+                    throw new Exception("Unable to invite guest, " + ex.Message, ex);
                 }
 
                 // If they entered a username, then whatever the error is just throw it, for example, user not found

MediaBrowser.Model/Configuration/UserConfiguration.cs

@@ -27,7 +27,6 @@ namespace MediaBrowser.Model.Configuration
         public bool DisplayMissingEpisodes { get; set; }
         public bool DisplayUnairedEpisodes { get; set; }
 
-        public string[] ExcludeFoldersFromGrouping { get; set; }
         public string[] GroupedFolders { get; set; }
 
         public SubtitlePlaybackMode SubtitleMode { get; set; }