More check for remvoing scene and scene group. - Without this check, it can make Inkscape crashed if we remove a node that had been removed. - Check whether it owns a parent node before removing. - A removed node has no parent node.

madbutterfly (0.0-3) intrepid; urgency=low

  * Initial release

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