[Misc] Fix Benchmark TTFT Calculation for Chat Completions #3768
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This PR fixes the TTFT calculation when running serving benchmark with chat completions API. Previously it didn't check if actual
contentisNullin the delta, and thusrolechunk with emptycontentcould be mistakenly treated as a real token response.Note: This does not affect existing CI results since by default
vLLMuses completions instead of chat completions for benchmarking.Fixes #3759