[fix] unit phrase should return None if there's no config available for a particular zone type (again enforcing the idea that venues typically don't have sub-building information)
[fix] unit phrase should return None if there's no config available for a particular zone type (again enforcing the idea that venues typically don't have sub-building information)

openvenues/libpostal,openvenues/libpostal,openvenues/libpostal,openvenues/libpostal