Lokaltog/powerline — pull request #759 by fitztrev (2014-01-22 20:56:31+00:00)
Title: Fix Syntastic deprecation warning

`hasErrorsOrWarningsToDisplay` has been deprecated in Syntastic (https://github.com/scrooloose/syntastic/commit/d629be9)

This fixes the warning that appears when opening a new file:

```
syntastic: warning: function hasErrorsOrWarningsToDisplay() is deprecated, please use !isEmpty() instead
```