bugfix(Azure): fix index out of range error due to Azure Openai reponses an empty chunk at first (#820)

Co-authored-by: 一帆 <zhang.f@digitalcnzz.com>

Author: zfanswer

pilot/model/proxy/llms/chatgpt.py

@@ -172,6 +172,11 @@ def chatgpt_generate_stream(
         res = client.chat.completions.create(messages=history, **payloads)
         text = ""
         for r in res:
+            # logger.info(str(r))
+            # Azure Openai reponse may have empty choices body in the first chunk
+            # to avoid index out of range error
+            if not r.get("choices"):
+                continue
             if r.choices[0].delta.content is not None:
                 content = r.choices[0].delta.content
                 text += content
@@ -186,6 +191,8 @@ def chatgpt_generate_stream(
 
         text = ""
         for r in res:
+            if not r.get("choices"):
+                continue
             if r["choices"][0]["delta"].get("content") is not None:
                 content = r["choices"][0]["delta"]["content"]
                 text += content
@@ -220,6 +227,8 @@ async def async_chatgpt_generate_stream(
         res = await client.chat.completions.create(messages=history, **payloads)
         text = ""
         for r in res:
+            if not r.get("choices"):
+                continue
             if r.choices[0].delta.content is not None:
                 content = r.choices[0].delta.content
                 text += content
@@ -233,6 +242,8 @@ async def async_chatgpt_generate_stream(
 
         text = ""
         async for r in res:
+            if not r.get("choices"):
+                continue
             if r["choices"][0]["delta"].get("content") is not None:
                 content = r["choices"][0]["delta"]["content"]
                 text += content