Show Products widget only when WC is active

[MAILPOET-1843]

assets/js/src/newsletter_editor/blocks/products.js

@@ -548,6 +548,9 @@ Module.ProductsWidgetView = base.WidgetView.extend({
 });
 
 App.on('before:start', function beforeStartApp(BeforeStartApp) {
+  if (!window.mailpoet_woocommerce_active) {
+    return;
+  }
   BeforeStartApp.registerBlockType('products', {
     blockModel: Module.ProductsBlockModel,
     blockView: Module.ProductsBlockView,