Only add the YamlDriver to the chain when symfony/yaml
is installed
#1497
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The
JMS\Serializer\Metadata\Driver\YamlDriver
class requiresSymfony\Component\Yaml\Yaml
to function. Givensymfony/yaml
is an optional dependency, it shouldn't be arbitrarily included in the driver chain when using the default driver factory and specifying a list of metadata paths. This PR updates the factory to check for theYaml
class before adding the YAML driver to the chain.