Harrison/azure content filter (#4645)

Co-authored-by: Rob Kopel <R0bk@users.noreply.github.com>

langchain/chat_models/azure_openai.py

@@ -7,6 +7,7 @@ from typing import Any, Dict, Mapping
 from pydantic import root_validator
 
 from langchain.chat_models.openai import ChatOpenAI
+from langchain.schema import ChatResult
 from langchain.utils import get_from_dict_or_env
 
 logger = logging.getLogger(__name__)
@@ -119,3 +120,12 @@ class AzureChatOpenAI(ChatOpenAI):
     @property
     def _llm_type(self) -> str:
         return "azure-openai-chat"
+
+    def _create_chat_result(self, response: Mapping[str, Any]) -> ChatResult:
+        for res in response["choices"]:
+            if res.get("finish_reason", None) == "content_filter":
+                raise ValueError(
+                    "Azure has not provided the response due to a content"
+                    " filter being triggered"
+                )
+        return super()._create_chat_result(response)