[FIX] base: _name_search of state

When creating a new customer, the selection list for the state is empty
unless the country is filled in.

This is an issue since users usually fill the address fields in the
sequential order: street, city, state, zip and then country. Since no
state proposal is displayed, users tend to create a new state.

Introduced in 5fcf891.

opw-1941579

odoo/addons/base/models/res_country.py

@@ -121,7 +121,7 @@ class CountryState(models.Model):
     @api.model
     def _name_search(self, name, args=None, operator='ilike', limit=100, name_get_uid=None):
         args = args or []
-        if 'country_id' in self.env.context:
+        if self.env.context.get('country_id'):
             args = expression.AND([args, [('country_id', '=', self.env.context.get('country_id'))]])
 
         if operator == 'ilike' and not (name or '').strip():