Issue/194 Use default value for nil adjust_mw

[petermnhull]

Pull Request

Description

Fixes #194

Also includes a few minor additional improvements:

• Fix flake8 errors in tests, mainly due to unused imports
• Fix typing errors which were getting caught in linting locally
• Fix some typos in comments.
• Fix BST-dependent tests in test_read. This one I'm a bit less sure on, but I believe there is a timezone dependant test here which relies on non-BST timing which failed locally until I removed the timezones. See errors below, let me know if there's something I'm missing here.

FAILED tests/read/test_read.py::test_get_latest_input_data_last_updated - assert datetime.datetime(2023, 7, 1, 18, 29, 57, 40344) == datetime.datetime(2023, 7, 1, 17, 29, 57, 40344)
FAILED tests/read/test_read.py::test_update_latest_input_data_last_updated - assert datetime.datetime(2023, 7, 1, 18, 29, 57, 387618) == datetime.datetime(2023, 7, 1, 17, 29, 57, 38...

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Tested this locally on bare metal in a virtualenv.

• [x] Yes

If your changes affect data processing, have you plotted any changes? i.e. have you done a quick sanity check?

• [x] Yes / NA

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings