refactor: use customer utils to retrieven customer email address for output

composer.json

@@ -21,7 +21,7 @@
         "php": ">=7.2",
         "quiqqer\/quiqqer": ">=1.5|dev-master|dev-dev",
         "quiqqer\/erp": "^1.3|dev-master|dev-dev",
-        "quiqqer\/customer": "1.*|dev-master|dev-dev",
+        "quiqqer/customer": "^1.1|dev-master|dev-dev",
         "quiqqer\/payments": "1.*|dev-master|dev-dev",
         "quiqqer\/payment-transactions": "1.*|dev-master|dev-dev",
         "quiqqer\/htmltopdf": "1.*|dev-master|dev-dev",

src/QUI/ERP/Accounting/Invoice/Output/OutputProviderInvoice.php

@@ -237,9 +237,7 @@ public static function getEmailAddress($entityId)
             return false;
         }
 
-        $email = $Customer->getAttribute('email');
-
-        return $email ?: false;
+        return QUI\ERP\Customer\Utils::getInstance()->getEmailByCustomer($Customer);
     }
 
     /**