hgext/__init__.py

exchange: allow passing no includes/excludes to `pull()`

I would expect that `exchange.pull(includepats=[])` results in an empty list of
include patterns to be passed to the remote, but it doesn't currently because we
check for any truthy value instead of checking specifically for `not None`.

import pkgutil

__path__ = pkgutil.extend_path(__path__, __name__)