Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
可以看到sse响应的最后一个消息里面没有content字段。这也是符合openai api规范的。

{
    "id": "chatcmpl-2c954dc0-0ba5-4015-8117-4fe22ff7cf04",
    "created": 1750421392,
    "model": "qwen2.5-72b",
    "object": "chat.completion.chunk",
    "choices": [{
            "finish_reason": "stop",
            "index": 0,
            "delta": {}
        }
    ]
}

Screenshots
日志里面的报错信息如下
2025-06-20 20:15:29,994 [ 499854] WARN - #cc.unitmesh.devti.llm2.LLMProvider2 - sse stream: {"id":"chatcmpl-d408e5e0-9294-40ce-af08-50915b45227d","created":1750421729,"model":"qwen2.5-72b","object":"chat.completion.chunk","choices":[{"index":0,"delta":{"content":" here","tool_calls":[]}}]}
2025-06-20 20:15:30,037 [ 499897] WARN - #cc.unitmesh.devti.llm2.LLMProvider2 - sse stream: {"id":"chatcmpl-d408e5e0-9294-40ce-af08-50915b45227d","created":1750421729,"model":"qwen2.5-72b","object":"chat.completion.chunk","choices":[{"index":0,"delta":{"content":" to","tool_calls":[]}}]}
2025-06-20 20:15:30,053 [ 499913] WARN - #cc.unitmesh.devti.llm2.LLMProvider2 - sse stream: {"id":"chatcmpl-d408e5e0-9294-40ce-af08-50915b45227d","created":1750421729,"model":"qwen2.5-72b","object":"chat.completion.chunk","choices":[{"index":0,"delta":{"content":" help","tool_calls":[]}}]}
2025-06-20 20:15:30,092 [ 499952] WARN - #cc.unitmesh.devti.llm2.LLMProvider2 - sse stream: {"id":"chatcmpl-d408e5e0-9294-40ce-af08-50915b45227d","created":1750421730,"model":"qwen2.5-72b","object":"chat.completion.chunk","choices":[{"index":0,"delta":{"content":"!","tool_calls":[]}}]}
2025-06-20 20:15:30,109 [ 499969] WARN - #cc.unitmesh.devti.llm2.LLMProvider2 - sse stream: {"id":"chatcmpl-d408e5e0-9294-40ce-af08-50915b45227d","created":1750421730,"model":"qwen2.5-72b","object":"chat.completion.chunk","choices":[{"index":0,"delta":{"content":"","role":"assistant","tool_calls":[]}}]}
2025-06-20 20:15:30,161 [ 500021] WARN - #cc.unitmesh.devti.llm2.LLMProvider2 - sse stream: {"id":"chatcmpl-d408e5e0-9294-40ce-af08-50915b45227d","created":1750421730,"model":"qwen2.5-72b","object":"chat.completion.chunk","choices":[{"finish_reason":"stop","index":0,"delta":{}}]}
2025-06-20 20:15:30,161 [ 500021] WARN - #cc.unitmesh.devti.llm2.LLMProvider2 - cannot parse with responseResolver: $.choices[0].delta.content, ori data: {"id":"chatcmpl-d408e5e0-9294-40ce-af08-50915b45227d","created":1750421730,"model":"qwen2.5-72b","object":"chat.completion.chunk","choices":[{"finish_reason":"stop","index":0,"delta":{}}]}
java.lang.IllegalStateException: cannot parse with responseResolver: $.choices[0].delta.content, ori data: {"id":"chatcmpl-d408e5e0-9294-40ce-af08-50915b45227d","created":1750421730,"model":"qwen2.5-72b","object":"chat.completion.chunk","choices":[{"finish_reason":"stop","index":0,"delta":{}}]}
at cc.unitmesh.devti.llm2.LLMProvider2$sseStream$eventSource$1.onEvent(LLMProvider2.kt:99)
at okhttp3.internal.sse.RealEventSource.onEvent(RealEventSource.kt:101)
at okhttp3.internal.sse.ServerSentEventReader.completeEvent(ServerSentEventReader.kt:108)
at okhttp3.internal.sse.ServerSentEventReader.processNextEvent(ServerSentEventReader.kt:52)
at okhttp3.internal.sse.RealEventSource.processResponse(RealEventSource.kt:75)
at okhttp3.internal.sse.RealEventSource.onResponse(RealEventSource.kt:46)
at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:840)

Desktop (please complete the following information):

• OS: [e.g. Windows] win11
• Main Version [e.g. 22]
• IDEA Version [e.g. Intellij IDEA 2024.3] idea2024.3

Additional context
当前代码这里的处理，没有考虑sse最后一个消息finish_reason不为空的时候的特殊情况。

                val chunk: String = runCatching {
                    val result: String? = JsonPath.parse(data)?.read(responseResolver)
                    result ?: ""
                }.getOrElse {
                    logger.warn(IllegalStateException("cannot parse with responseResolver: ${responseResolver}, ori data: $data"))
                    ""
                }

                result += chunk