After adding all existing series, show no series message to user.

NzbDrone.Web/Scripts/NzbDrone/addSeries.js

@@ -47,6 +47,8 @@ $(".addExistingButton").live('click', function () {
         },
         success: function() {
             root.hide('highlight', 'fast');
+            if ($('.existingSeries').filter(":visible").length === 1)
+                reloadExistingSeries();
         }
     });