XmlBPMNProcessDumper.dump() misses conditionExpression in sequenceFlow

If a process has SplitNode and some conditionExpression in sequenceFlow, XmlBPMNProcessDumper.dump() misses the conditionExpression in sequenceFlow.

original bpmn

<conditionExpression xsi:type="tFormalExpression" language="http://www.java.com/java" >return 1==(Integer)kcontext.getVariable("myVar");</conditionExpression>

bpmn generated by XmlBPMNProcessDumper.dump()

<conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" ></conditionExpression>

It is because SplitNodeBuilder doesn't map constraint.getConstraint() to ReturnValueConstraintEvaluator.