add defaultNull to version
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@ -554,6 +554,7 @@ class Configuration implements ConfigurationInterface
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->fixXmlConfig('base_url')
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->children()
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->scalarNode('version')
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->defaultNull()
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->beforeNormalization()
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->ifTrue(function ($v) { return '' === $v; })
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->then(function ($v) { return; })
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