Clean up SettingsController to not check for Null's as empty strings will not be null when returned.

class variables for _settingsSaved, _settingsFailed to easily change all error messages when saving

NzbDrone.Web/Views/Settings/Index.aspx

@@ -10,5 +10,7 @@
 </asp:Content>
 
 <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
+    <script src="/Scripts/MicrosoftAjax.js" type="text/javascript"></script>
+    <script src="/Scripts/MicrosoftMvcValidation.js" type="text/javascript"></script>
     <% Html.RenderPartial(ViewData["viewName"].ToString()); %>
 </asp:Content>