[Bug]: [Local Message] 异常，Json解析异常

### Installation Method | 安装方法与平台

Docker-Compose（Linux）

### Version | 版本

Latest | 最新版

### OS | 操作系统

Docker

### Describe the bug | 简述

使用“学术语料润色”时报错，显示“[Local Message] 异常”，具体表现应该为Json解析异常。如下：

[Local Message] 异常

Traceback (most recent call last):
File "./request_llms/bridge_chatgpt.py", line 339, in predict
if ('data: [DONE]' in chunk_decoded) or (len(chunkjson['choices'][0]["delta"]) == 0):
KeyError: 'delta'

data: {"choices":[{"content_filter_offsets":{"check_offset":3656,"start_offset":3656,"end_offset":4651},"content_filter_results":{"hate":{"filtered":false,"severity":"safe"},"self_harm":{"filtered":false,"severity":"safe"},"sexual":{"filtered":false,"severity":"safe"},"violence":{"filtered":false,"severity":"safe"}},"finish_reason":null,"index":0}],"created":0,"id":"","model":"","object":""}data: {"choices":[{"delta":{"content":" solve"},"finish_reason":null,"index":0,"logprobs":null}],"created":1728877146,"id":"chatcmpl-AI6DCuO6n6kLm5NgOPcVUOTmce7XA","model":"gpt-4o-2024-05-13","object":"chat.completion.chunk","system_fingerprint":"fp_67802d9a6d"}data: {"choices":[{"delta":{"content":" it"},"finish_reason":null,"index":0,"logprobs":null}],"created":1728877146,"id":"chatcmpl-AI6DCuO6n6kLm5NgOPcVUOTmce7XA","model":"gpt-4o-2024-05-13","object":"chat.completion.chunk","system_fingerprint":"fp_67802d9a6d"}data: {"choices":[{"delta":{"content":" as"},"finish_reason":null,"index":0,"logprobs":null}],

...

"created":1728877146,"id":"chatcmpl-AI6DCuO6n6kLm5NgOPcVUOTmce7XA","model":"gpt-4o-2024-05-13","object":"chat.completion.chunk","system_fingerprint":"fp_67802d9a6d"}data: {"choices":[{"content_filter_offsets":{"check_offset":8258,"start_offset":8168,"end_offset":8588},"content_filter_results":{"hate":{"filtered":false,"severity":"safe"},"self_harm":{"filtered":false,"severity":"safe"},"sexual":{"filtered":false,"severity":"safe"},"violence":{"filtered":false,"severity":"safe"}},"finish_reason":null,"index":0}],"created":0,"id":"","model":"","object":""}data: [DONE]

### Screen Shot | 有帮助的截图


### Terminal Traceback & Material to Help Reproduce Bugs | 终端traceback（如有） + 帮助我们复现的测试材料样本（如有）

_No response_

Start in request_llms/bridge_chatgpt.py around predict at line 339 and inspect the streamed chunks shown in the traceback, especially those whose choices entry has content_filter fields but no delta. Reproduce the academic-polishing request with Docker Compose and verify that these response chunks no longer raise a KeyError and that streaming completes normally.

Written by the indexing model from the issue text.