An operation to add a pattern-formatter resource does not correctly marshal the XML configuration

Using an operation like /subsystem=logging/pattern-formatter=formatter:add will correctly add the formatter to the model. However after a reload an exception is logged as the default values are not marshalled into the XML.

Along with this even if the element is marshalled, the pattern attribute seems to get set to "undefined" in the logging configuration which just logs the "undefined" for every log message.