Pathfield for Text component hyperlink in 6.3 Classic UI

As a part of upgrade from 5.6.1 to 6.3.

In AEM 6.3 Pathfield for hyperlink in text component handled under LinkDialog.js is not us allowing to leave blank

We are using basic libs LInkDialog.js... Code for pathfield

{

                    "itemId": "href",

                    "name": "href",

                    "parBrowse": false,

                    "anchor": CQ.themes.Dialog.ANCHOR,

                    /*"fieldLabel": CQ.I18n.getMessage("Link"),*/

                    "xtype": "pathfield",

                    "ddGroups": [

                        CQ.wcm.EditBase.DD_GROUP_PAGE,

                        CQ.wcm.EditBase.DD_GROUP_ASSET

                    ],

                    "fieldDescription": CQ.I18n.getMessage("Select file from the Content Finder or enter the complete URL"),

                    "listeners": {

                        "dialogselect": {

                            "fn": this.selectAnchor,

                            "scope": this

                        },

                        "render": this.initHrefDragAndDrop

                    },

                    "validator": CUI.rte.Utils.scope(this.validateLink, this),

                    "validationEvent": "keyup",

                    "escapeAmp": true

                }

Validate Link

    validateLink: function(href) {

        var linkRules = this.getParameter("linkRules");

        if (!linkRules) {

            return (href.length > 0 ? true : CQ.I18n.getMessage("No link provided"));

        }

        var isValid = linkRules.validateHref(href);

        return isValid || CQ.I18n.getMessage("Invalid link");

    }

});

Should i need to add any Properties or config options?