Don't pass on None payloads

JordonPhillips · JordonPhillips · commit 16f4b322a02c · 2025-07-30T18:04:03.000+02:00
diff --git a/packages/smithy-http/src/smithy_http/serializers.py b/packages/smithy-http/src/smithy_http/serializers.py
@@ -115,7 +115,7 @@ def begin_struct(self, schema: Schema) -> Iterator[ShapeSerializer]:
                     binding_matcher,
                 )
                 yield binding_serializer
-                payload = payload_serializer.payload
+                payload = payload_serializer.payload or b""
                 try:
                     content_length = len(payload)
                 except TypeError:
@@ -300,7 +300,7 @@ def begin_struct(self, schema: Schema) -> Iterator[ShapeSerializer]:
                     payload_serializer, binding_matcher
                 )
                 yield binding_serializer
-                payload = payload_serializer.payload
+                payload = payload_serializer.payload or b""
                 try:
                     content_length = len(payload)
                 except TypeError:
