Unsolved ListModel append object with null value

[Vi67]

Hello,

I have a new bug sinse I upgraded Qt 5.5 to Qt 5.5.1. This problem didn't exist in Qt5.5.

When I add a javascript object to a ListModel, and this object has a null value, the attribute with null value is disappearing. This is a simple example :

ListModel {
	id: myList
}

function foo() {
	var obj = {
		attribute1 : 'value ok',
		attribute2 : null
	};
	
	console.log(JSON.stringify(obj));
	// show {attribute1: 'value ok', attribute2 : null}
	
	myList.append(obj);
	console.log(JSON.stringify(myList));
	// show only {attribute1: 'value ok'}
}

[dheerendra]

I tried to repro the problem. First I tried the same thing on 5.5 on mac. When we print the mylist i just see the qml: {"objectName":"","count":2,"dynamicRoles":false}. I don't see anything. Is there something missing here ?