Do not print empty country information.

doc/changelog.txt

@@ -9,6 +9,7 @@ Fixes:
 - logging: Only write configured output parts in CSV logger.
 - logging: Correctly encode CSV output.
   Closes: SF bug #3263848
+- logging: Don't print empty country information.
 
 Changes:
 - gui: Improved display of internal errors.

linkcheck/checker/urlbase.py

@@ -459,7 +459,7 @@ class UrlBase (object):
         """Try to ask GeoIP database for country info."""
         if self.host:
             country = geoip.get_country(self.host)
-            if country is not None:
+            if country:
                 self.add_info(_("URL is located in %(country)s.") %
                 {"country": _(country)})