Fix type error when downloading drive root

www/common/onlyoffice/inner.js

@@ -1406,6 +1406,7 @@ define([
                             }
                             break;
                         case "cursor":
+                            if (cursor && cursor.updateCursor) {
                                 cursor.updateCursor({
                                     type: "cursor",
                                     messages: [{
@@ -1415,6 +1416,7 @@ define([
                                         useridoriginal: myOOId
                                     }]
                                 });
+                            }
                             break;
                         case "getLock":
                             handleLock(obj, send);

www/common/sframe-common-file.js

@@ -698,7 +698,7 @@ define([
             var ctx = {
                 fileHost: privateData.fileHost,
                 get: common.getPad,
-                sframeChan: sframeChan,
+                sframeChan: common.getSframeChannel(),
                 cache: common.getCache()
             };