fixing the null pointer exception

components/device-mgt/org.wso2.carbon.device.mgt.ui/src/main/resources/jaggeryapps/devicemgt/app/modules/utility.js

@@ -161,6 +161,7 @@ utility = function () {
      * @returns {*}
      */
     publicMethods.encodeJson = function (text) {
+        if (text) {
             return text
                 .replace(/\\u003c/g, "<")
                 .replace(/</g, "&lt;")
@@ -169,7 +170,10 @@ utility = function () {
                 .replace(/\\u0027/g, "&#39;")
                 .replace(/'/g, "&#39;")
                 .replace(/\\"/g, "&quot;")
-            .replace(/\\u0022/g, "&quot;")
+                .replace(/\\u0022/g, "&quot;");
+        } else {
+            return "";
+        }
     };
 
     return publicMethods;