VDX - pretty print does not kick in when element has no value

11:41:29,881 ERROR [org.jboss.as.server] (Controller Boot Thread) WFLYSRV0055: Caught exception during boot: org.jboss.as.controller.persistence.ConfigurationPersistenceException: WFLYCTL0085: Failed to parse configuration
	at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:145)
	at org.jboss.as.server.ServerService.boot(ServerService.java:355)
	at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:302)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException
	at org.jboss.dmr.StringModelValue.asBoolean(StringModelValue.java:157)
	at org.jboss.dmr.ModelNode.asBoolean(ModelNode.java:267)
	at org.jboss.as.controller.parsing.ParseUtils.parseAttributeValue(ParseUtils.java:573)
	at org.jboss.as.controller.SimpleAttributeDefinition.parse(SimpleAttributeDefinition.java:230)
	at org.jboss.as.controller.SimpleAttributeDefinition.parse(SimpleAttributeDefinition.java:159)
	at org.jboss.as.controller.SimpleAttributeDefinition.parseAndSetParameter(SimpleAttributeDefinition.java:186)
	at org.jboss.as.webservices.dmr.WSSubsystem11Reader.readElement(WSSubsystem11Reader.java:83)
	at org.jboss.as.webservices.dmr.WSSubsystem11Reader.readElement(WSSubsystem11Reader.java:55)
	at org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:122)
	at org.jboss.staxmapper.XMLExtendedStreamReaderImpl.handleAny(XMLExtendedStreamReaderImpl.java:69)
	at org.jboss.as.server.parsing.StandaloneXml_5.parseServerProfile(StandaloneXml_5.java:591)
	at org.jboss.as.server.parsing.StandaloneXml_5.readServerElement(StandaloneXml_5.java:245)
	at org.jboss.as.server.parsing.StandaloneXml_5.readElement(StandaloneXml_5.java:144)
	at org.jboss.as.server.parsing.StandaloneXml.readElement(StandaloneXml.java:107)
	at org.jboss.as.server.parsing.StandaloneXml.readElement(StandaloneXml.java:49)
	at org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:122)
	at org.jboss.staxmapper.XMLMapperImpl.parseDocument(XMLMapperImpl.java:76)
	at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:126)
	... 3 more