symfony/symfony — pull request #11615 by xabbuh (2014-08-08 09:26:38+00:00)
Title: [Validator] return empty metadata collection if none do exist

| Q | A
| ------------- | ---
| Bug fix? | yes
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets |
| License | MIT
| Doc PR | [The reference to the documentation PR if any]

Backport of #11614 for Symfony 2.3 and 2.4.