Fixed issue with loading update page when there is no update available.

NzbDrone.Web/Views/Update/Index.cshtml

@@ -11,6 +11,7 @@ else
     <h2>
         Available Update: @Model.UpdatePackage.Version
         @Ajax.ActionLink("Update", "StartUpdate", "Update", new AjaxOptions{ OnSuccess = "updateStarted" })
+        @Html.HiddenFor(m => m.UpdatePackage.Version)
     </h2> 
 }
 @if (Model.LogFiles.Count != 0)
@@ -32,6 +33,7 @@ else
 {
     <script type="text/javascript">
         function updateStarted() {
+            var expectedVersion = $('#UpdatePackage_Version').val();
             var errors = 0;
 
             //Pool the server every 5 seconds for a change in state
@@ -47,7 +49,7 @@ else
                         if (errors > 0) {
                             //Kill the timer, redirect
                             $.doTimeout('updateStarted');
-                            window.location = '/Update/Post?expectedVersion=@Model.UpdatePackage.Version';
+                            window.location = '/Update/Post?expectedVersion=' + expectedVersion;
                         }
                     }
                 });