Merge pull request #6333 from minrk/tree-slash-redirect

allow slash in root->tree redirect

IPython/html/tree/handlers.py

@@ -80,5 +80,5 b' default_handlers = ['
     (r"/tree%s" % notebook_path_regex, TreeHandler),
     (r"/tree%s" % path_regex, TreeHandler),
     (r"/tree", TreeHandler),
-    (r"", TreeRedirectHandler),
+    (r"/?", TreeRedirectHandler),
     ]