fix the nested list bug that makes email not be delivered #7349

Job	Run time
Get test file matrix	2s
setup (3.8, ubuntu-latest)	1s
setup (3.12, ubuntu-latest)	1s
setup (3.8, ubuntu-20.04)	1s
Run test_utils.py with Python 3.8 on ubuntu-20.04	1m 34s
Run test_test_utils.py with Python 3.8 on ubuntu-20.04	1m 9s
Run test_sync.py with Python 3.8 on ubuntu-20.04	1m 40s
Run test_subworkflows.py with Python 3.8 on ubuntu-20.04	9m 6s
Run test_schema.py with Python 3.8 on ubuntu-20.04	2m 21s
Run test_refgenie.py with Python 3.8 on ubuntu-20.04	1m 39s
Run test_params_file.py with Python 3.8 on ubuntu-20.04	1m 13s
Run test_modules.py with Python 3.8 on ubuntu-20.04	7m 3s
Run test_list.py with Python 3.8 on ubuntu-20.04	1m 17s
Run test_lint_utils.py with Python 3.8 on ubuntu-20.04	1m 9s
Run test_lint.py with Python 3.8 on ubuntu-20.04	3m 24s
Run test_launch.py with Python 3.8 on ubuntu-20.04	1m 53s
Run test_download.py with Python 3.8 on ubuntu-20.04	3m 51s
Run test_create_logo.py with Python 3.8 on ubuntu-20.04	1m 4s
Run test_create_app.py with Python 3.8 on ubuntu-20.04	2m 3s
Run test_create.py with Python 3.8 on ubuntu-20.04	1m 27s
Run test_components.py with Python 3.8 on ubuntu-20.04	12m 57s
Run test_cli.py with Python 3.8 on ubuntu-20.04	1m 3s
Run test_bump_version.py with Python 3.8 on ubuntu-20.04	1m 42s
coverage	1m 10s
	58m 50s

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