Fix the issue of segmentation fault when the pattern of a mbe is not setted. For Skia graphic engine, a mbe does not always have a pattern. For example, a color paint does not set a pattern on a mbe for a shape. So, we check if pattern is setted before accessing it.

madbutterfly (0.0-3) intrepid; urgency=low

  * Initial release

 -- Ben Lau <benlau@visionware.com.hk>  Thu, 09 Apr 2009 20:00:10 +0800