Fix invalid value types for item_schema (#43926)

* Fix invalid value types for item_schema

* Fix linter issues

Author: YusakuNo1

sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluate/_evaluate_aoai.py

@@ -217,7 +217,12 @@ def _begin_single_aoai_evaluation(
 
 
 def _combine_item_schemas(data_source_config: Dict[str, Any], kwargs: Dict[str, Any]) -> None:
-    if "item_schema" not in kwargs or "properties" not in kwargs["item_schema"]:
+    if (
+        not kwargs
+        or not kwargs.get("item_schema")
+        or not isinstance(kwargs["item_schema"], dict)
+        or "properties" not in kwargs["item_schema"]
+    ):
         return
 
     if "item_schema" in data_source_config:

sdk/evaluation/azure-ai-evaluation/tests/unittests/test_evaluate_aoai.py

@@ -60,6 +60,18 @@ def test_combine_item_schemas_without_item_schema(self, default_data_source_conf
         assert data_source_config["item_schema"]["properties"] == expected_properties
         assert data_source_config["item_schema"]["required"] == expected_required
 
+        # "item_schema" as None in kwargs
+        kwargs = {"item_schema": None}
+        _combine_item_schemas(data_source_config, kwargs)
+        assert data_source_config["item_schema"]["properties"] == expected_properties
+        assert data_source_config["item_schema"]["required"] == expected_required
+
+        # "item_schema" is a wrong value in kwargs
+        kwargs = {"item_schema": 12345}
+        _combine_item_schemas(data_source_config, kwargs)
+        assert data_source_config["item_schema"]["properties"] == expected_properties
+        assert data_source_config["item_schema"]["required"] == expected_required
+
         # "item_schema" without "properties" in kwargs
         kwargs = {"item_schema": {}}
         _combine_item_schemas(data_source_config, kwargs)