petl-developers / petl / 40805073934

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Close the grid table drawn by look() for header-only tables (#761)

This PR has the objective of making `look()` output a complete table for
a table that has a header but no data rows, e.g. `etl.look([('foo',
'bar')])`. The default grid style stopped after the header separator, so
it had no bottom border:

Co-authored-by: Juarez Rudsatz <juarezr@gmail.com>

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