fix: Use Pydantic exclude_none=True to omit null namespace fields from catalog serialization (#825)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: aaronsteers

airbyte/destinations/base.py

@@ -265,7 +265,7 @@ def _write_airbyte_message_stream(
         with as_temp_files(
             files_contents=[
                 self._hydrated_config,
-                catalog_provider.configured_catalog.model_dump_json(),
+                catalog_provider.configured_catalog.model_dump_json(exclude_none=True),
             ]
         ) as [
             config_file,

airbyte/sources/base.py

@@ -752,7 +752,7 @@ def _read_with_catalog(
         with as_temp_files(
             [
                 self._hydrated_config,
-                catalog.model_dump_json(),
+                catalog.model_dump_json(exclude_none=True),
                 state.to_state_input_file_text() if state else "[]",
             ]
         ) as [