improve code readability (#10448)

plugins/UserCountryMap/Controller.php

@@ -50,7 +50,16 @@ class Controller extends \Piwik\Plugin\Controller
 
         $period = Common::getRequestVar('period');
         $date = Common::getRequestVar('date');
-        $segment = $segmentOverride ? : Request::getRawSegmentFromRequest() ? : '';
+
+        if (!empty($segmentOverride)) {
+            $segment = $segmentOverride;
+        } else {
+            $segment = Request::getRawSegmentFromRequest();
+            if (empty($segment)) {
+                $segment = '';
+            }
+        }
+        
         $token_auth = Piwik::getCurrentUserTokenAuth();
 
         $view = new View('@UserCountryMap/visitorMap');