When a param in an Ajax request is an empty string, a null param is send to the server.

Now I fixed this with the following override

Code:
//Ext 4.2 Beta bugfix
Ext.override(Ext.Object, {

  toQueryString: function(object, recursive) {
        var paramObjects = [],
            params = [],
            i, j, ln, paramObject, value;

        for (i in object) {
            if (object.hasOwnProperty(i)) {
                paramObjects = paramObjects.concat(ExtObject.toQueryObjects(i, object[i], recursive));
            }
        }

        for (j = 0, ln = paramObjects.length; j < ln; j++) {
            paramObject = paramObjects[j];
            value = paramObject.value;

            if (Ext.isEmpty(value)) {
                value = '';
            }
            else if (Ext.isDate(value)) {
                value = Ext.Date.toString(value);
            }

           // causes empty params in request
           // params.push(encodeURIComponent(paramObject.name) +
           //     (value !== '' ? ('=' + encodeURIComponent(String(value))) : ''));

          //previous code   
          params.push(encodeURIComponent(paramObject.name) + '=' + encodeURIComponent(String(value)));
        
        }

        return params.join('&');
    }


});

ExtObject = Ext.Object;
Was there a reason to change the toQueryString? I see empty parameters as a form of information so it should be send to the server.