removes config check on p.aspx since we need it to show the feeds when installer is done.

src/Umbraco.Web/umbraco.presentation/install/utills/p.aspx.cs

@@ -15,13 +15,6 @@ namespace umbraco.presentation.install.utills
     {
         protected void Page_Load(object sender, EventArgs e)
         {
-
-            //if its not configured then we can continue
-            if (ApplicationContext.Current == null || ApplicationContext.Current.IsConfigured)
-            {
-                throw new AuthenticationException("The application is already configured");
-            }
-
             // Stop Caching in IE
             Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);