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Problem:
combination of --format and --output results in an empty output file
Example:
flake8 --format json --output $(tty)
flake8 --format json-pretty --output $(tty)
Pre-fix:
output truncated in file
Post-fix:
expected output in file
Subclasses of base.BaseFormatter.close need to call super().close() in order to close the output file handle and flush buffered data to the output file otherwise it is lost when flake8 exist.