* verify $this->frames is array and set it to empty

<a href="https://github.com/sonique6784"><img src="https://avatars.githubusercontent.com/u/7600467?v=2" align="left" width="96" height="96" hspace="10"></img></a> **Issue by [sonique6784](https://github.com/sonique6784)**
_Thursday Aug 28, 2014 at 05:59 GMT_
_Originally opened as https://github.com/oyejorge/less.php/pull/164_

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_**[sonique6784](https://github.com/sonique6784)** included the following code: https://github.com/oyejorge/less.php/pull/164/commits_