修复图片地址获取失败问题

src/routers/deep_agent_chat.py

@@ -177,6 +177,7 @@ async def chat_stream(request: DeepAgentChatRequest):
             if current_image_path:
                 bucket, object_name = current_image_path.split('/', 1)
                 image_url = get_presigned_url(oss_client=minio_client, bucket=bucket, object_name=object_name)
+                if image_url is not None:
                     content.append({"type": "image_url", "image_url": {"url": image_url}})
 
         final_messages = {

src/server/utils/new_oss_client.py

@@ -80,7 +80,7 @@ def get_presigned_url(oss_client, bucket, object_name):
         return presigned_url
     except Exception as e:
         print(f"get_presigned_url exception :{e}")
-        return "object not found"
+        return None
 
 
 def is_minio_file_exist(oss_client: Minio, bucket_name: str, object_name: str) -> bool: