Update

trunk/_vendor/symfony/monolog-bundle/DependencyInjection/Compiler/FixEmptyLoggerPass.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\MonologBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Fixes loggers with no handlers (by registering a "null" one).
+ *
+ * Monolog 1.x adds a default handler logging on STDERR when a logger has
+ * no registered handlers. This is NOT what what we want in Symfony, so in such
+ * cases, we add a "null" handler to avoid the issue.
+ *
+ * Note that Monolog 2.x does not register a default handler anymore, so this pass can
+ * be removed when MonologBundle minimum version of Monolog is bumped to 2.0.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @see https://github.com/Seldaek/monolog/commit/ad37b7b2d11f300cbace9f5e84f855d329519e28
+ */
+class FixEmptyLoggerPass implements CompilerPassInterface
+{
+    private $channelPass;
+
+    public function __construct(LoggerChannelPass $channelPass)
+    {
+        $this->channelPass = $channelPass;
+    }
+
+    public function process(ContainerBuilder $container)
+    {
+        $container->register('monolog.handler.null_internal', 'Monolog\Handler\NullHandler');
+        foreach ($this->channelPass->getChannels() as $channel) {
+            $def = $container->getDefinition($channel === 'app' ? 'monolog.logger' : 'monolog.logger.'.$channel);
+            foreach ($def->getMethodCalls() as $method) {
+                if ('pushHandler' === $method[0]) {
+                    continue 2;
+                }
+            }
+
+            $def->addMethodCall('pushHandler', array(new Reference('monolog.handler.null_internal')));
+        }
+    }
+}