fix: prod build break

Author: abose

src/editor/Editor.js

@@ -1375,14 +1375,14 @@ define(function (require, exports, module) {
                 && history.done[history.done.length -1];
             while(lastHistoryItem && lastHistoryItem.restorePointName !== restorePointName) {
                 newHistory = self.getHistory();
-                historyLength = newHistory?.done?.length;
+                historyLength = newHistory.done.length;
                 cm.undoSelection();
                 newHistory = self.getHistory();
-                if(historyLength === newHistory?.done?.length) {
+                if(historyLength === newHistory.done.length) {
                     // undo selection didnt do anything, try undo
                     cm.undo();
                     newHistory = self.getHistory();
-                    if(historyLength === newHistory?.done?.length) {
+                    if(historyLength === newHistory.done.length) {
                         // we cant undo, and this will go into an infinite loop if we continue.
                         console.error("Could not undo history to restore snapshot!");
                         break;