Only load WC data when WC is active

MAILPOET-5467

mailpoet/lib/AdminPages/Pages/DynamicSegments.php

@@ -127,6 +127,7 @@ class DynamicSegments {
     }
 
     $data['product_attributes'] = [];
+    if ($this->woocommerceHelper->isWooCommerceActive()) {
       $productAttributes = $this->woocommerceHelper->wcGetAttributeTaxonomies();
 
       foreach ($productAttributes as $attribute) {
@@ -147,6 +148,7 @@ class DynamicSegments {
           ];
         }
       }
+    }
 
     $data['product_categories'] = $this->wpPostListLoader->getWooCommerceCategories();