`gt hub pull rebase --abort` broken

After doing `git hub pull rebase --pause` on any PR:
```
$ git hub pull rebase --abort
Traceback (most recent call last):
  File "/usr/bin/git-hub", line 1903, in <module>
    main()
  File "/usr/bin/git-hub", line 1897, in main
    args.run(parser, args)
  File "/usr/bin/git-hub", line 614, in check_config_and_run
    cmd.run(parser, args)
  File "/usr/bin/git-hub", line 1469, in run
    cls.abort_rebase(args)
  File "/usr/bin/git-hub", line 1508, in abort_rebase
    aborted = cls.pop_stashed() or aborted
  File "/usr/bin/git-hub", line 1589, in pop_stashed
    warf("Stash produced by this command found "
NameError: global name 'warf' is not defined
```