RT#37761 dijkstra_shortest_path freezes

[duffee]

There is example result of calling method "get_edges()" from directed
graph (100 nodes, 400 edges max).

When I call "$graph->dijkstra_shortest_path('4_5','5_7')" it works fine,
but when I call "$graph->dijkstra_shortest_path('5_7', '4_5')" (actually
there is no such path) it just freezes..

Thanks!
toapole@gmail.com
dijkstra_shortest_path_freezes_output.txt