fixed config post issue

NzbDrone.Core/Controllers/DbConfigController.cs

@@ -68,6 +68,9 @@ private string GetValue(string key, object defaultValue, bool makePermanent)
 
         private void SetValue(string key, string value)
         {
+            if (String.IsNullOrEmpty(key)) throw new ArgumentOutOfRangeException("key");
+            if (value== null) throw new ArgumentNullException("key");
+
             _logger.DebugFormat("Writing Setting to file. Key:'{0}' Value:'{1}'", key, value);
 
             _sonicRepo.Add(new Config { Key = key, Value = value });

NzbDrone.Web/Controllers/SettingsController.cs

@@ -25,7 +25,7 @@ public ActionResult Index()
         }
 
         [HttpPost]
-        public ActionResult Save(SettingsModel model)
+        public ActionResult Index(SettingsModel model)
         {
             if (ModelState.IsValid)
             {

NzbDrone.Web/Views/Settings/Index.aspx

@@ -1,6 +1,6 @@
 <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<NzbDrone.Web.Models.SettingsModel>" %>
-<%@ Import Namespace="NzbDrone.Web.Controllers" %>
 
+<%@ Import Namespace="NzbDrone.Web.Controllers" %>
 <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
     Index
 </asp:Content>
@@ -9,6 +9,7 @@
         Settings</h2>
     <% using (Html.BeginForm())
        { %>
+    <%: Html.ValidationSummary(true, "Account creation was unsuccessful. Please correct the errors and try again.") %>
     <div>
         <fieldset>
             <legend>General</legend>