Issue #17532: merge from 3.3

Lib/idlelib/EditorWindow.py

@@ -821,7 +821,11 @@ class EditorWindow(object):
                     menuEventDict[menu[0]][prepstr(item[0])[1]] = item[1]
         for menubarItem in self.menudict:
             menu = self.menudict[menubarItem]
-            end = menu.index(END) + 1
+            end = menu.index(END)
+            if end is None:
+                # Skip empty menus
+                continue
+            end += 1
             for index in range(0, end):
                 if menu.type(index) == 'command':
                     accel = menu.entrycget(index, 'accelerator')