[CI/Build] fix: Add the +empty tag to the version only when the VLLM_TARGET_DEVICE envvar was explicitly set to "empty" #20921

# to view logs

	name: yapf

	on:
	# Trigger the workflow on push or pull request,
	# but only for the main branch
	push:
	branches:
	- main
	pull_request:
	branches:
	- main
	jobs:
	yapf:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install yapf==0.32.0
	pip install toml==0.10.2
	- name: Running yapf
	run: \|
	yapf --diff --recursive .

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