[sc-8498] check availability of "document" object

package.json

@@ -1,6 +1,6 @@
 {
   "name": "addsearch-js-client",
-  "version": "0.8.5",
+  "version": "0.8.6",
   "description": "AddSearch API JavaScript client",
   "main": "index.js",
   "jsdelivr": "./dist/addsearch-js-client.min.js",

src/cookie.js

@@ -1,11 +1,17 @@
 const setCookie = function(cookieName, cookieValue, expireDays) {
+  if (!document) {
+    return;
+  }
   const date = new Date();
   date.setTime(date.getTime() + (expireDays * 24 * 60 * 60 * 1000));
   let expires = "expires="+ date.toUTCString();
   document.cookie = cookieName + "=" + cookieValue + ";" + expires + ";path=/";
 }
 
 const getCookie = function(cookieName) {
+  if (!document) {
+    return;
+  }
   let name = cookieName + "=";
   let decodedCookie = decodeURIComponent(document.cookie);
   let cookieArray = decodedCookie.split(';');
@@ -22,6 +28,9 @@ const getCookie = function(cookieName) {
 }
 
 const deleteCookie = function(name) {
+  if (!document) {
+    return;
+  }
   document.cookie = name +'=; Path=/; Expires=Thu, 01 Jan 2000 00:00:01 GMT;';
 }