Idp.getInstance() is called two times in MessagingStub_NodeJS

[d-koppenhagen]

As you can see here the function Idp.getInstance() is called two times (once in Lin 115 and once in Line119 inside Idp.getInstance().createIdentity()).
As both Idp instances should be the same, I think this would be a better way without calling Idp.getInstance() two times:

var thatIdp = Idp.getInstance();
that.createIdentity(message.from, function(identity) {
    message.from = identity;
    thatIdp.createIdentities(message.to, function(identityArr) {
        message.to = identityArr;
        that.baseStub.sendOtherMessages(message);
    });
});