You can check your object is null or empty

javascript-empty-object-control.js

var test = {};
if (test==null && isEmpty(test)) {
        console.log("is empty");
} else {
        console.log("is not empty");
}
function isEmpty(obj) {
        for (var key in obj) {
                if (obj.hasOwnProperty(key)) 
                        return false;
                }
        return true;
}