Add support for having no default country
I understand that it makes sense to set a default country and preselect this one if your business is mostly active in one region. For example, if your focus area is the US, I get it that preselecting "United States of America" in the country field is a reasonable choice. But, image a provider which runs multiple data centers all over Europe. How would I pick a default country?
As long as GeoIP guesses the country of the customer, its correctly selected anyhow. But some forms in Blesta don't use GeoIP or GeoIP support might just not be enabled, then I would prefer a blank field (maybe empty or "---") as preselection then any (most probably wrong) preselecting.