Issue with overwriting user settings for Indexers resolved.

Reworked RssSyncProvider to make it cleaner.

SeasonProvider was returning the reveresed boolean result

Indexer changed to not store empty strings as null when saving config (ApiUrl).

NzbDrone.Core/Repository/Indexer.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
 using System.Linq;
 using System.Text;
 using SubSonic.SqlGeneration.Schema;
@@ -9,11 +10,12 @@ namespace NzbDrone.Core.Repository
 {
     public class Indexer
     {
-        [SubSonicPrimaryKey (true)]
+        [SubSonicPrimaryKey(true)]
         public string IndexerName { get; set; }
         public string RssUrl { get; set; }
 
         [SubSonicNullStringAttribute]
+        [DisplayFormat(ConvertEmptyStringToNull = false)]
         public string ApiUrl { get; set; }
         public bool Enabled { get; set; }
         public int Order { get; set; }