Issue #3293926: Service decorates non-existant service when module not installed
This copies the YamlFileLoader changes from https://github.com/symfony/symfony/commit/f167c77eafc55dcce5da7bc7a34842b33328fa4e
Closes #3293926
This copies the YamlFileLoader changes from https://github.com/symfony/symfony/commit/f167c77eafc55dcce5da7bc7a34842b33328fa4e
Closes #3293926