chore: fail samples nox session if python version is missing#316

gcf-merge-on-green[bot] merged 1 commit intomaingoogleapis/python-bigquery-storage:mainfrom

owl-bot-update-lock-82b12321da4446a73cb11bcb6812fbec8c105abda3946d46e6394e5fbfb64c0fgoogleapis/python-bigquery-storage:owl-bot-update-lock-82b12321da4446a73cb11bcb6812fbec8c105abda3946d46e6394e5fbfb64c0fCopy head branch name to clipboard