Fixed bug with Ester

pablogsal · pablogsal · commit b0c78ca1b581 · 2016-06-29T23:56:02.000+02:00
diff --git a/a_star/a_star.py b/a_star/a_star.py
@@ -88,7 +88,7 @@ def a_star(graph, start, end):
 
         current_node = frontier.pop()
 
-        if current_node.point == end:
+        if not current_node or current_node.point == end:
             return frontier
 
         for neighbor in graph.neighbors( current_node.point ):
