minor #19713 [FrameworkBundle] Remove duplicated code in RouterDebugCommand (JhonnyL)

This PR was merged into the 2.7 branch.

Discussion
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[FrameworkBundle] Remove duplicated code in RouterDebugCommand

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Commits
-------

20a69aa [FrameworkBundle] Remove duplicated code in RouterDebugCommand

Author: fabpot

Command/RouterDebugCommand.php

@@ -83,10 +83,10 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         $name = $input->getArgument('name');
         $helper = new DescriptorHelper();
+        $routes = $this->getContainer()->get('router')->getRouteCollection();
 
         if ($name) {
-            $route = $this->getContainer()->get('router')->getRouteCollection()->get($name);
-            if (!$route) {
+            if (!$route = $routes->get($name)) {
                 throw new \InvalidArgumentException(sprintf('The route "%s" does not exist.', $name));
             }
             $this->convertController($route);
@@ -96,8 +96,6 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 'name' => $name,
             ));
         } else {
-            $routes = $this->getContainer()->get('router')->getRouteCollection();
-
             foreach ($routes as $route) {
                 $this->convertController($route);
             }