Symfony version(s) affected: all supported versions

Description
Finder::in() throws an InvalidArgumentException when one of the directories is not found. However, a valid directory name for a directory which does not exist is IMHO a normal case for the Finder and not an invalid argument. Therefore, non-existing directories should throw an dedicated Exception of the Finder component instead of the generic InvalidArgumentException.
This would also simplify catching such exceptions.

How to reproduce

require_once('vendor/autoload.php');
$f = new Symfony\Component\Finder\Finder();
$f->directories()->in('no');

Throws InvalidArgumentException although the argument is a valid directory name. A dedicated exception which can be specifically caught would be more useful and improve DX.

Possible Solution
Create a dedicated DirectoryNotFoundException, which extends InvalidArgumentException for BC. Later it would probably make more sense to extend RuntimeException instead.