Features: 1) Optimize loop filtering for digital products in order processing;

Fixes: 1) None;

Extra: 1) Minor readability improvement via simplified query logic;

core/signals.py

@@ -92,10 +92,7 @@ def process_order_changes(instance, created, **_kwargs):
             if not instance.is_whole_digital:
                 send_order_created_email.delay(instance.uuid)
 
-            for order_product in instance.order_products.filter(status="DELIVERING"):
-                if not order_product.product.is_digital:
-                    continue
-
+            for order_product in instance.order_products.filter(status="DELIVERING", product__is_digital=True):
                 try:
                     logger.debug("Trying to buy: %s", str(order_product.uuid))
                     vendor_name = (