fix: fix-incorrect-comparison

Author: Zaimwa9

src/common/metadata/serializers.py

@@ -68,7 +68,7 @@ def update_metadata(
 
         content_type = ContentType.objects.get_for_model(instance.__class__)
 
-        if metadata_data:
+        if not metadata_data:
             Metadata.objects.filter(
                 object_id=instance.pk, content_type=content_type
             ).delete()