[Bugfix][Benchmark] Make sure the output length > 0 when testing prefill workload.#20786

simon-mo merged 2 commits intovllm-project:mainvllm-project/vllm:mainfrom

KuntaiDu:kuntai-fix-benchmark-output-lenKuntaiDu/vllm:kuntai-fix-benchmark-output-lenCopy head branch name to clipboard