This is very frequently facing issue, checking a javascript object is empty or not. You can do that using plain Javascript or jQuery.
Here is example how you do it using javascript:
1) var sampleObj = {one:"1"};
Object.keys(sampleObj).length) //return 1
2) var sampleObj = {};
Object.keys(sampleObj).length) //return 0
Jquery also provide isEmptyObject() function to check whether object empty or not. you can use it as below:
1) var sampleObj = {one:"1"};
jQuery.isEmptyObject(sampleObj) //return false
2) var sampleObj = {};
jQuery.isEmptyObject(sampleObj) //return true