Guard for unbounded faces

Arrangement_on_surface_2/include/CGAL/draw_arrangement_2.h

@@ -65,6 +65,7 @@ namespace draw_function_for_arrangement_2
            it != face->inner_ccbs_end(); ++it)
       { add_ccb(*it); }
 
+      if (! face->is_unbounded()) {
         for (Outer_ccb_const_iterator it = face->outer_ccbs_begin();
              it != face->outer_ccbs_end(); ++it)
         {
@@ -72,6 +73,7 @@ namespace draw_function_for_arrangement_2
           draw_region(*it);
         }
       }
+    }
 
     /// Add a Connected Component of the Boundary.
     void add_ccb(Ccb_halfedge_const_circulator circ)