Fix configurable product

Author: lruozzi9

public/js/back-in-stock-notification.js

@@ -96,9 +96,9 @@ document.addEventListener("DOMContentLoaded", function (event) {
       }
     }
   });
-  observer.observe(container, { attributes: false, childList: true, subtree: true });
 
   if (container) {
+    observer.observe(container, { attributes: false, childList: true, subtree: true });
     subscribeToBackInStockNotification(container)
   }
 })

templates/_addSubscription.html.twig

@@ -4,7 +4,7 @@
 {% set variant = product|sylius_resolve_variant %}
 
 {% if product.isConfigurable %}
-    <div id="notification-overlay" class="ui modal">
+    <div id="notification-overlay" class="ui modal" data-back-in-stock-notification-form-container="true">
         {{ render(url('webgriffe_back_in_stock_notification_add_subscription')) }}
     </div>
 {% elseif not is_product_variant_available(variant) %}