bug #25033 [FrameworkBundle] Dont create empty bundles directory by default (ro0NL)

This PR was merged into the 3.4 branch.

Discussion
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[FrameworkBundle] Dont create empty bundles directory by default

| Q             | A
| ------------- | ---
| Branch?       | 3.4 / 4.1?
| Bug fix?      | yes?
| New feature?  | no
| BC breaks?    | no?
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #... <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!--highly recommended for new features-->

we still run `assets:install` by default, which in bundle-less apps gives this annoying empty public/bundles dir and some useless cli output, all the time. This fixes it.

Commits
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f8e7478583 [FrameworkBundle] Dont create empty bundles directory

Author: fabpot

Command/AssetsInstallCommand.php

@@ -120,9 +120,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             }
         }
 
-        // Create the bundles directory otherwise symlink will fail.
         $bundlesDir = $targetArg.'/bundles/';
-        $this->filesystem->mkdir($bundlesDir, 0777);
 
         $io = new SymfonyStyle($input, $output);
         $io->newLine();
@@ -186,18 +184,22 @@ protected function execute(InputInterface $input, OutputInterface $output)
             }
         }
         // remove the assets of the bundles that no longer exist
-        $dirsToRemove = Finder::create()->depth(0)->directories()->exclude($validAssetDirs)->in($bundlesDir);
-        $this->filesystem->remove($dirsToRemove);
+        if (is_dir($bundlesDir)) {
+            $dirsToRemove = Finder::create()->depth(0)->directories()->exclude($validAssetDirs)->in($bundlesDir);
+            $this->filesystem->remove($dirsToRemove);
+        }
 
-        $io->table(array('', 'Bundle', 'Method / Error'), $rows);
+        if ($rows) {
+            $io->table(array('', 'Bundle', 'Method / Error'), $rows);
+        }
 
         if (0 !== $exitCode) {
             $io->error('Some errors occurred while installing assets.');
         } else {
             if ($copyUsed) {
                 $io->note('Some assets were installed via copy. If you make changes to these assets you have to run this command again.');
             }
-            $io->success('All assets were successfully installed.');
+            $io->success($rows ? 'All assets were successfully installed.' : 'No assets were provided by any bundle.');
         }
 
         return $exitCode;