'Make sure empty attributes don\'t raise exceptions.'

def test_boolean_attr(self):

    parsed_eq('<p><video    controls    height="120">        <source    src="/some/path/file.ogv"    type="video/ogv"></video></p>', '<p><video    controls=""    height="120">        <source    src="/some/path/file.ogv"    type="video/ogv"></video></p>')
