Add CI for gpt-oss model on hopper (#8851)

python/sglang/test/simple_eval_gpqa.py

@@ -71,6 +71,8 @@ class GPQAEval(Eval):
                 )
             ]
             response_text = sampler(prompt_messages)
+            if response_text is None:
+                response_text = ""
             match = re.search(ANSWER_PATTERN_MULTICHOICE, response_text)
             extracted_answer = match.group(1) if match else None
             score = 1.0 if extracted_answer == correct_answer else 0.0