mercurial/__main__.py

phabricator: stringify the argument to `getattr()`

This fixes a "TypeError: getattr(): attribute name must be string" crash and
subsequent test spew.  This likely broke in 18c8c18993f0 and was missed in CI
because `pytest-vcr` is missing.

def run():
    from . import demandimport

    with demandimport.tracing.log('hg script'):
        demandimport.enable()
        from . import dispatch

        dispatch.run()


if __name__ == '__main__':
    run()