fix(python-cdk): Ensure at least one element returned by decoder (#43043)

Author: maxi297

airbyte-cdk/python/airbyte_cdk/sources/declarative/decoders/json_decoder.py

@@ -25,11 +25,17 @@ def is_stream_response(self) -> bool:
         return False
 
     def decode(self, response: requests.Response) -> Generator[Mapping[str, Any], None, None]:
+        """
+        Given the response is an empty string or an emtpy list, the function will return a generator with an empty mapping.
+        """
         try:
             body_json = response.json()
             if not isinstance(body_json, list):
                 body_json = [body_json]
-            yield from body_json
+            if len(body_json) == 0:
+                yield {}
+            else:
+                yield from body_json
         except requests.exceptions.JSONDecodeError:
             logger.warning(f"Response cannot be parsed into json: {response.status_code=}, {response.text=}")
             yield {}

airbyte-cdk/python/unit_tests/sources/declarative/decoders/test_json_decoder.py

@@ -14,13 +14,17 @@
 
 
 @pytest.mark.parametrize(
-    "response_body, expected_json",
-    [("", [{}]), ('{"healthcheck": {"status": "ok"}}', [{"healthcheck": {"status": "ok"}}])],
+    "response_body, first_element",
+    [
+        ("", {}),
+        ("[]", {}),
+        ('{"healthcheck": {"status": "ok"}}', {"healthcheck": {"status": "ok"}})
+    ],
 )
-def test_json_decoder(requests_mock, response_body, expected_json):
+def test_json_decoder(requests_mock, response_body, first_element):
     requests_mock.register_uri("GET", "https://airbyte.io/", text=response_body)
     response = requests.get("https://airbyte.io/")
-    assert list(JsonDecoder(parameters={}).decode(response)) == expected_json
+    assert next(JsonDecoder(parameters={}).decode(response)) == first_element
 
 
 @pytest.mark.parametrize(