Check another reference to the editor in the mainwindow

spyder/app/mainwindow.py

@@ -1501,7 +1501,7 @@ def update_edit_menu(self):
         # Comment, uncomment, indent, unindent...
         if not console and not_readonly:
             # This is the editor and current file is writable
-            if self.editor:
+            if hasattr(self, 'editor'):
                 for action in self.editor.edit_menu_actions:
                     action.setEnabled(True)