git contribs throws ValueError

[gkotian]

When git-contribs is run against a clone of the oh-my-zsh repository, it throws this:

➜  oh-my-zsh (master) > git contribs   
                  Name                      Commits    Lines Added    Lines Deleted
Marc Cornellà                                  421         8424           5422
Robby Russell                                  132         1177            629
Andrew Janke                                    82         7612           2716
...
...
...
Traceback (most recent call last):
  File "/home/gautam/play/git_scripts/git-contribs", line 57, in <module>
    num_additions, num_deletions, file_name = stats_entry.split('\t')
ValueError: not enough values to unpack (expected 3, got 1)