minor symfony#14081 [Config][DX] improve file loader error message for missing resource (cordoval)

This PR was merged into the 2.3 branch.

Discussion
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[Config][DX] improve file loader error message for missing resource

|Q            |A     |
|---          |---   |
|Bug Fix?     |y     |
|New Feature? |n     |
|BC Breaks?   |n     |
|Deprecations?|n     |
|Tests Pass?  |y     |
|Fixed Tickets|symfony#11958|
|License      |MIT   |
|Doc PR       |      |

Commits
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a2deb61 [DX] improve file loader error for router/other resources in bundle

Author: fabpot

src/Symfony/Component/Config/Exception/FileLoaderLoadException.php

@@ -36,7 +36,8 @@ public function __construct($resource, $sourceResource = null, $code = null, $pr
         if ('@' === $resource[0]) {
             $parts = explode(DIRECTORY_SEPARATOR, $resource);
             $bundle = substr($parts[0], 1);
-            $message .= ' '.sprintf('Make sure the "%s" bundle is correctly registered and loaded in the application kernel class.', $bundle);
+            $message .= sprintf(' Make sure the "%s" bundle is correctly registered and loaded in the application kernel class.', $bundle);
+            $message .= sprintf(' If the bundle is registered, make sure the bundle path "%s" is not empty.', $resource);
         } elseif ($previous) {
             // include the previous exception, to help the user see what might be the underlying cause
             $message .= ' '.sprintf('(%s)', $previous->getMessage());