Edit quicklist results in error

```
Error detected while processing function buffest#qflist_do[6]..function buffest#qflist_do[3]..BufEnter Autocommands for "<buffer=2>"..function buffest#read_qflist[1]..buffest#read_list[7]..buffest#save_listfields[1]..buffest#has_listfields:
line    2:
E121: Undefined variable: v:none
```