'Verify that course_structure returns empty info for non-existed block_types.'

def test_course_structure_with_non_existed_block_types(self):

    block_types = ['phantom']
    structure = course_structure(self.course.id, block_types=block_types)
    expected = {u'root': unicode(self.course.location), u'blocks': {}}
    self.assertDictEqual(structure, expected)
