Fixes #9959. Fix unit test.

extension/Classes/Core/Typo3/T3Handler.php

@@ -121,6 +121,11 @@ class T3Handler {
      */
     public static function updateT3QfqConfig($key, $value) {
 
+        if (defined('PHPUNIT_QFQ')) {
+            // There is no  typo3conf/LocalConfiguration.php in phpunit.
+            return;
+        }
+
         // Restore T3 ErrorHandler. T3 throws exceptions - those should be handled by T3!
         restore_error_handler();