fix distribution delete bug, in signals

apps/product/signals.py

@@ -51,7 +51,13 @@ def update_quota_remaining(sender, instance, **kwargs):
     # if _from_signal=True prevent from maximum recursion loop
     if getattr(instance, '_from_signal', False):
         return
-    remaining_distribution_weight(instance)
+
+    # when delete object, prevent from update fields error
+    if kwargs.get('signal') == post_delete:
+        if instance.parent_distribution:
+            remaining_distribution_weight(instance.parent_distribution)
+    else:
+        remaining_distribution_weight(instance)
 
 
 def update_product_stats(instance: Product):