#6622 Logger refactoring: StdErrHandler: had to revert a previous change

In the tests, logging is disabled. But not when testing the logger itself…

core/Log/Handler/StdErrHandler.php

@@ -36,7 +36,10 @@ class StdErrHandler extends AbstractProcessingHandler
 
     protected function write(array $record)
     {
-        $this->writeToStdErr($record['formatted']);
+        // Do not log on stderr during tests (prevent display of errors in CI output)
+        if (! defined('PIWIK_TEST_MODE')) {
+            $this->writeToStdErr($record['formatted']);
+        }
 
         // This is the result of an old hack, I guess to force the error message to be displayed in case of errors
         // TODO we should get rid of it somehow