feature #5 Add a warning when no routes are defined (fabpot)

This PR was squashed before being merged into the master branch (closes #5).

Discussion
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Add a warning when no routes are defined

![image](https://user-images.githubusercontent.com/47313/32694414-ebd6fbe8-c6f3-11e7-8ec4-58088685a820.png)

Commits
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2c2917f simplified some code
31c6606 added a warning when no routes are defined

Author: fabpot

src/Command/AbstractCommand.php

@@ -111,11 +111,11 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $params = $this->getParameters();
         $this->generator->generate($params, $this->getFiles($params));
 
-        $this->io->writeln('');
+        $this->io->newLine();
         $this->io->writeln(' <bg=green;fg=white>          </>');
         $this->io->writeln(' <bg=green;fg=white> Success! </>');
         $this->io->writeln(' <bg=green;fg=white>          </>');
-        $this->io->writeln('');
+        $this->io->newLine();
 
         $this->writeNextStepsMessage($params, $this->io);
     }

src/Command/MakeControllerCommand.php

@@ -13,11 +13,13 @@
 
 use Symfony\Bundle\MakerBundle\ConsoleStyle;
 use Symfony\Bundle\MakerBundle\DependencyBuilder;
+use Symfony\Bundle\MakerBundle\Generator;
 use Symfony\Bundle\MakerBundle\Str;
 use Symfony\Bundle\MakerBundle\Validator;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Routing\RouterInterface;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 
 /**
@@ -28,6 +30,15 @@ final class MakeControllerCommand extends AbstractCommand
 {
     protected static $defaultName = 'make:controller';
 
+    private $router;
+
+    public function __construct(Generator $generator, RouterInterface $router)
+    {
+        $this->router = $router;
+
+        parent::__construct($generator);
+    }
+
     public function configure()
     {
         $this
@@ -63,6 +74,11 @@ protected function getResultMessage(array $params): string
 
     protected function writeNextStepsMessage(array $params, ConsoleStyle $io)
     {
+        if (!count($this->router->getRouteCollection())) {
+            $io->text('<error> Warning! </> No routes configuration defined yet.');
+            $io->text('           You should probably uncomment the annotation routes in <comment>config/routes.yaml</>');
+            $io->newLine();
+        }
         $io->text('Next: Open your new controller class and add some pages!');
     }