How do you mix the conditional operator ( ? : ) and deconstructed function returns?

I have a function in a CLASS

MyClass.prototype.fn = function(){
    /* ... some impressive code */
    return {isA: value1, isB: value2};
}

All that is important is it returns an object {isA: ?, isB: ?} ready for deconstructing.

Later I will have an instance of my class:

MyClass myC;

However, when I use it there is a chance the MyClass object myC is null.

So I want to use the conditional operator, just in case myC is null.

My question is, is there a better way of getting the default than just creating a temporary object on the fly with isA and isB set to false?

Ie, is this the best way to do it?

let {isA, isB} = myC ? myC.fn() : {isA: false, isB: false};