Allow country and city to be empty when creating a user

[ianmcn]

Actual behaviour

If you don't specify a city or country, it defaults to Szczecin PL.

Expected behaviour

Moodle does not require a city or country to be added, so not specifying one should leave it blank rather than put in fake information.

Steps to reproduce

Create a user account without specifying city or country. User will be created with Szczecin PL.