mileszs/ack.vim — pull request #108 by yudoufu (2014-03-17 03:21:00+00:00)
Title: Fix for ack command not installed.

Raised error on ack not installed server environment:

```
Error detected while processing /home/yudoufu/dotfiles/.vim/bundle/ack.vim/plugin/ack.vim:
line 16:
E15: Invalid expression:
```

so, I fixed `s:ackprg_version` execution place.