Trigger SystemExit upon init in non-interactive editor#

import pytest
from nbproject import header
# header() this should be ignored
with pytest.raises(SystemExit):
    header(
        parent=["z14KWQKD4bwE", "r4Dkcgt2HIfh"], pypackage="anndata"
    )  # header() triggers exit init
ℹ️ Initializing.