Remove abusive abort.

include/fcl/traversal/traversal_node_shapes.h

@@ -79,7 +79,6 @@ public:
   /// @brief Intersection testing between leaves (two shapes)
   void leafTesting(int, int, FCL_REAL&) const
   {
-    abort ();
     if(model1->isOccupied() && model2->isOccupied())
     {
       bool is_collision = false;