Fix 'lock is null' error in onlyoffice apps

www/common/onlyoffice/sdkjs/cell/sdk-all-min.js

@@ -3717,8 +3717,9 @@ AscBrowser.convertToRetinaValue = function(value, isScale)
       var bSendEnd = false;
       for (var block in data["locks"]) {
         if (data["locks"].hasOwnProperty(block)) {
-          var lock = data["locks"][block], blockTmp = (this._isExcel || this._isPresentation) ? lock["block"]["guid"] : lock["block"];
+          var lock = data["locks"][block];
           if (lock !== null) {
+            var blockTmp = (this._isExcel || this._isPresentation) ? lock["block"]["guid"] : lock["block"];
             this._locks[blockTmp] = {"state": 0, "user": lock["user"], "time": lock["time"], "changes": lock["changes"], "block": lock["block"]};
             if (this.onLocksReleased) {
               // true - lock with save

www/common/onlyoffice/sdkjs/slide/sdk-all-min.js

@@ -3717,8 +3717,9 @@ AscBrowser.convertToRetinaValue = function(value, isScale)
       var bSendEnd = false;
       for (var block in data["locks"]) {
         if (data["locks"].hasOwnProperty(block)) {
-          var lock = data["locks"][block], blockTmp = (this._isExcel || this._isPresentation) ? lock["block"]["guid"] : lock["block"];
+          var lock = data["locks"][block];
           if (lock !== null) {
+            var blockTmp = (this._isExcel || this._isPresentation) ? lock["block"]["guid"] : lock["block"];
             this._locks[blockTmp] = {"state": 0, "user": lock["user"], "time": lock["time"], "changes": lock["changes"], "block": lock["block"]};
             if (this.onLocksReleased) {
               // true - lock with save

www/common/onlyoffice/sdkjs/word/sdk-all-min.js

@@ -3717,8 +3717,9 @@ AscBrowser.convertToRetinaValue = function(value, isScale)
       var bSendEnd = false;
       for (var block in data["locks"]) {
         if (data["locks"].hasOwnProperty(block)) {
-          var lock = data["locks"][block], blockTmp = (this._isExcel || this._isPresentation) ? lock["block"]["guid"] : lock["block"];
+          var lock = data["locks"][block];
           if (lock !== null) {
+            var blockTmp = (this._isExcel || this._isPresentation) ? lock["block"]["guid"] : lock["block"];
             this._locks[blockTmp] = {"state": 0, "user": lock["user"], "time": lock["time"], "changes": lock["changes"], "block": lock["block"]};
             if (this.onLocksReleased) {
               // true - lock with save