Removed checks against Drawable as these are no longer required.
Removed checks against Drawable as these are no longer required.


git-svn-id: aa838dfc23441284dd616281de4245daec5d2135@14455 16af8721-9629-0410-8352-f15c8da7e697

artoolkit/osg,artoolkit/osg,scrawl/osg,tomasthoresen/osg,tomasthoresen/osg,scrawl/osg,jtorresfabra/osg,jtorresfabra/osg,marchelbling/osg,openscenegraph/osg,artoolkit/osg,jtorresfabra/osg,marchelbling/osg,artoolkit/osg,marchelbling/osg,scrawl/osg,marchelbling/osg,openscenegraph/osg,jtorresfabra/osg,tomasthoresen/osg,openscenegraph/osg,openscenegraph/osg,scrawl/osg,tomasthoresen/osg