[welcome] Only do GeoIP query if it's useful

- If badly-configured, then type is none; this is warned about
   in the constructor of Handler()
 - Only run the query if it's a useful type.

src/modules/welcome/WelcomeViewStep.cpp

@@ -128,6 +128,8 @@ WelcomeViewStep::setConfigurationMap( const QVariantMap& configurationMap )
             CalamaresUtils::getString( geoip, "style" ),
             CalamaresUtils::getString( geoip, "url" ),
             CalamaresUtils::getString( geoip, "selector" ) );
+        if ( handler->type() != CalamaresUtils::GeoIP::Handler::Type::None )
+        {
             auto* future = new FWString();
             connect( future, &FWString::finished, [view=this, f=future, h=handler]()
             {
@@ -139,6 +141,12 @@ WelcomeViewStep::setConfigurationMap( const QVariantMap& configurationMap )
             } );
             future->setFuture( handler->queryRaw() );
         }
+        else
+        {
+            // Would not produce useful country code anyway.
+            delete handler;
+        }
+    }
 
 
     QString language = CalamaresUtils::getString( configurationMap, "languageIcon" );