gracefully handle stream chunks without "choices" field

Author: senko

pilot/utils/llm_connection.py

@@ -486,14 +486,14 @@ def return_result(result_data, lines_printed):
             try:
                 json_line = json.loads(line)
 
-                if len(json_line['choices']) == 0:
-                    continue
-
                 if 'error' in json_line:
                     logger.error(f'Error in LLM response: {json_line}')
                     telemetry.record_llm_request(token_count, time.time() - request_start_time, is_error=True)
                     raise ValueError(f'Error in LLM response: {json_line["error"]["message"]}')
 
+                if 'choices' not in json_line or len(json_line['choices']) == 0:
+                    continue
+
                 choice = json_line['choices'][0]
 
                 # if 'finish_reason' in choice and choice['finish_reason'] == 'function_call':