fix: undefined link if no value for url data field in grid

frappe/public/js/frappe/form/formatters.js

@@ -35,6 +35,7 @@ frappe.form.formatters = {
 	},
 	Data: function (value, df) {
 		if (df && df.options == "URL") {
+			if (!value) return;
 			return `<a href="${value}" title="Open Link" target="_blank">${value}</a>`;
 		}
 		value = value == null ? "" : value;