MAGETWO-52000: impossible to see what is wrong with cron - unhelpful error message

- code updates to fix QA issues and review comments

Author: ark99

setup/src/Magento/Setup/Console/Command/CronRunCommand.php

@@ -79,8 +79,6 @@ protected function execute(InputInterface $input, OutputInterface $output)
         if (!$this->deploymentConfig->isAvailable()) {
             $output->writeln($notification);
             $this->status->add('Magento is not installed.', \Psr\Log\LogLevel::INFO);
-
-            // we must have an exit code higher than zero to indicate something was wrong
             return \Magento\Framework\Console\Cli::RETURN_SUCCESS;
         }
 

setup/src/Magento/Setup/Model/Cron/SetupStreamHandler.php

@@ -6,7 +6,7 @@
 
 namespace Magento\Setup\Model\Cron;
 
-use Monolog\Handler\StreamHandler;
+use Magento\Framework\Filesystem\DriverInterface;
 
 /**
  * Setup specific stream handler
@@ -22,4 +22,15 @@ class SetupStreamHandler extends \Magento\Framework\Logger\Handler\Base
      * @var int
      */
     protected $loggerType = \Magento\Framework\Logger\Monolog::ERROR;
+
+    /**
+     * @param DriverInterface $filesystem
+     * @param string $filePath
+     */
+    public function __construct(
+        DriverInterface $filesystem,
+        $filePath = null
+    ) {
+        parent::__construct($filesystem, $filePath);
+    }
 }