Removing nulls from a Javascript object

NullRemover.js

 function removeNullIn(prop, obj) {
    console.info('We dont want nulls..', prop, obj);
    var pr = obj[prop];
    if (pr === null || pr === undefined) {
        delete obj[prop];
    }
    else if (typeof pr === 'object') {
        for (var i in pr) {
            removeNullIn(i, pr)
        }
    };
}

function removeNull(obj) {
    for (var i in obj) {
        removeNullIn(i, obj);
    }
    return obj;
}

For the original
http://stackoverflow.com/questions/28473889/angularjs-merge-two-objects-ignoring-null-and-missing-values