Fix classification report if dataset has no labels #2042

	on:
	push:
	branches: [master]
	pull_request:
	branches: [master]

	jobs:
	test:
	runs-on: ubuntu-latest
	env:
	TRANSFORMERS_CACHE: ./cache/transformers
	FLAIR_CACHE_ROOT: ./cache/flair
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python 3.8
	id: setup-python
	uses: actions/setup-python@v4
	with:
	python-version: 3.8
	- name: Install Torch cpu
	run: pip install torch --index-url https://download.pytorch.org/whl/cpu
	- name: Install Flair dependencies
	run: pip install -e .
	- name: Install unittest dependencies
	run: pip install -r requirements-dev.txt
	- name: Show installed dependencies
	run: pip freeze
	- name: Cache downloaded models/datasets
	uses: actions/cache@v3
	with:
	path: ./cache
	key: cache-v1.1
	- name: Run tests
	run: \|
	python -c 'import flair'
	pytest --runintegration -vv

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