fix:修正chunk.choices 空值/空列表检查方式

Author: a61995987

astrbot/core/provider/sources/openai_source.py

@@ -326,7 +326,8 @@ async def _query_stream(
                     exc_info=True,
                 )
                 logger.warning(f"Saving chunk state error: {e}")
-            if len(chunk.choices) == 0:
+                
+            if not chunk.choices or len(chunk.choices) == 0:
                 continue
             delta = chunk.choices[0].delta
             # logger.debug(f"chunk delta: {delta}")