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b9353819 - corrects single file path validation logic (#13363)

corrects single file path validation logic (#13363) * corrects single file path validation logic * Update tests/modular_pipelines/test_modular_pipelines_common.py Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com> --------- Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>