madskristensen/WebEssentials2013 — pull request #641 by gcastre (2014-02-11 08:46:20+00:00)
Title: Less: Fix null ref

In less, if you have duplicate identifier WE will raise a null ref (because the error.Text is null)

To reproduce just copy/paste this in a less file (while debugging WE)

```less
body{
color:red;
}
body{
color: green;
}
```