From 0261f3b800644c4b741af444b51a535831847592 Mon Sep 17 00:00:00 2001
From: chrisnatali <chris.natali@gmail.com>
Date: Wed, 27 Apr 2016 21:38:42 -0400
Subject: [PATCH] check fnode for None explicitly (woops)

---
 sequencer/Sequencer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sequencer/Sequencer.py b/sequencer/Sequencer.py
index 9fc0ad7..dec257b 100644
--- a/sequencer/Sequencer.py
+++ b/sequencer/Sequencer.py
@@ -234,7 +234,7 @@ def _build_edge_wkt(self):
         r = self.results
         # Iterate through the nodes and their parent
         for rank, fnode, tnode in zip(r.index, r['Sequence..Upstream.id'], r['Sequence..Vertex.id']):
-            if fnode:
+            if not fnode == None:
                 if np.any(np.mod([fnode, tnode], 1) != 0):
                     raise Exception('Non-integral node index in results.')
                 # Set the edge attributes with those found in sequencing