Fix type error with sheet templates

www/common/onlyoffice/inner.js

@@ -861,7 +861,7 @@ define([
         var handleNewLocks = function (o, n) {
             var hasNew = false;
             // Check if we have at least one new lock
-            Object.keys(n).some(function (id) {
+            Object.keys(n || {}).some(function (id) {
                 if (typeof(n[id]) !== "object") { return; } // Ignore old format
                 // n[id] = { uid: lock, uid2: lock2 };
                 return Object.keys(n[id]).some(function (uid) {
@@ -873,7 +873,7 @@ define([
                 });
             });
             // Remove old locks
-            Object.keys(o).forEach(function (id) {
+            Object.keys(o || {}).forEach(function (id) {
                 if (typeof(o[id]) !== "object") { return; } // Ignore old format
                 Object.keys(o[id]).forEach(function (uid) {
                     // Removed lock