[Misc] Align error handling with upstream vLLM v0.14.0#1122

hsliuustc0106 merged 2 commits intovllm-project:mainvllm-project/vllm-omni:mainfrom

ceanna93:refactor/remove-validation-error-todoceanna93/vllm-omni:refactor/remove-validation-error-todoCopy head branch name to clipboard