Add early-out in collision for empty selectors.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3893 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CSceneCollisionManager.cpp

@@ -358,6 +358,9 @@ bool CSceneCollisionManager::getCollisionPoint(const core::line3d<f32>& ray,
 	}
 
 	s32 totalcnt = selector->getTriangleCount();
+	if ( totalcnt <= 0 )
+		return false;
+
 	Triangles.set_used(totalcnt);
 
 	s32 cnt = 0;