bug #1046 Fix Monolog error where newer versions does not allow an empty stream (henrikbjorn)

This PR was merged into the 2.0.x-dev branch.

Discussion
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Fix Monolog error where newer versions does not allow an empty stream

Fixes an error with Monolog, only problem is that i think i have already done this PR once before, but it have gone missing.

Commits
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26c7d59e Fix Monolog error where newer versions does not allow an empty stream

tests/Silex/Tests/Provider/MonologServiceProviderTest.php

@@ -66,7 +66,7 @@ class MonologServiceProviderTest extends \PHPUnit_Framework_TestCase
 
         $app->register(new MonologServiceProvider());
         $app['monolog.formatter'] = new JsonFormatter();
-        $app['monolog.logfile'] = null;
+        $app['monolog.logfile'] = "php://memory";
 
         $this->assertInstanceOf('Monolog\Formatter\JsonFormatter', $app['logger']->popHandler()->getFormatter());
     }