MAGETWO-51592: Make single tenant compiler work when Magento not installed

Check if modules are installed instead of checking if Magento installed

Author: Igor Melnikov

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

@@ -3,24 +3,24 @@
  * Copyright © 2016 Magento. All rights reserved.
  * See COPYING.txt for license details.
  */
-
 namespace Magento\Setup\Console\Command;
 
+use Magento\Framework\ObjectManagerInterface;
+use Magento\Framework\Filesystem\DriverInterface;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Magento\Framework\Filesystem;
 use Magento\Framework\App\Filesystem\DirectoryList;
-use Magento\Framework\Filesystem\DriverInterface;
-use Magento\Framework\ObjectManagerInterface;
 use Magento\Framework\App\DeploymentConfig;
 use Magento\Framework\Component\ComponentRegistrar;
+use Magento\Framework\Config\ConfigOptionsListConstants;
 use Magento\Setup\Model\ObjectManagerProvider;
 use Magento\Setup\Module\Di\App\Task\Manager;
 use Magento\Setup\Module\Di\App\Task\OperationFactory;
 use Magento\Setup\Module\Di\App\Task\OperationException;
 use Magento\Setup\Module\Di\App\Task\OperationInterface;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Helper\ProgressBar;
-use Symfony\Component\Console\Input\InputInterface;
-use Symfony\Component\Console\Output\OutputInterface;
 
 /**
  * Command to run compile in single-tenant mode
@@ -107,7 +107,7 @@ protected function configure()
     private function checkEnvironment()
     {
         $messages = [];
-        $config = $this->deploymentConfig->get(\Magento\Framework\Config\ConfigOptionsListConstants::KEY_MODULES);
+        $config = $this->deploymentConfig->get(ConfigOptionsListConstants::KEY_MODULES);
         if (!$config) {
             $messages[] = 'You cannot run this command because modules are not enabled. You can enable modules by'
              . ' running module:enable --all command.';