The fact that we have a path to a G2 embed file doesn't mean that it'…

…s still

valid so check to see that it's ok before proceeding.  This should resolve #458.

modules/g2_import/controllers/admin_g2_import.php

@@ -33,14 +33,16 @@ public function index() {
     $view->page_title = t("Gallery 2 import");
     $view->content = new View("admin_g2_import.html");
     $view->content->form = $this->_get_import_form();
-    $view->content->version = '';
+    $view->content->version = "";
 
     if (g2_import::is_initialized()) {
       $view->content->g2_stats = $g2_stats;
       $view->content->g2_sizes = $g2_sizes;
       $view->content->thumb_size = module::get_var("gallery", "thumb_size");
       $view->content->resize_size = module::get_var("gallery", "resize_size");
       $view->content->version = g2_import::version();
+    } else if (g2_import::is_configured()) {
+      $view->content->form->configure_g2_import->embed_path->add_error("invalid", 1);
     }
     g2_import::restore_error_reporting();
     print $view;