BUG: MonthOffset.name
- [ ] closes #xxxx
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

`is_anchored` is being accessed indirectly (its not a property).  As a result we never go down the other path, which would raise AttributeError since there is no `code_rule`.