Fix traceback when not passing file to -o option #698
Merged
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If precli-init is run without an argument for the -o, it will fail with a traceback due to the argparse.FileType not allowing a default of a str for a file name.
This change does the logic of detecting and opening files manually on its own. It will present an error if the file already exists to prevent overwriting. Except in the case where the file is pyproject.toml and the settings will be appended to it.