From f446c8ed33c812766e047e01d3356a9c3d96c617 Mon Sep 17 00:00:00 2001
From: Dean Gardiner <gardiner91@gmail.com>
Date: Mon, 25 Nov 2013 17:07:54 +1300
Subject: [PATCH] Updated QueryCondenser library

---
 libs/qcond/transformers/merge.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libs/qcond/transformers/merge.py b/libs/qcond/transformers/merge.py
index d82f249..f98dea3 100644
--- a/libs/qcond/transformers/merge.py
+++ b/libs/qcond/transformers/merge.py
@@ -135,6 +135,9 @@ class MergeTransformer(Transformer):
     def _merge(self, nodes, depth = 0):
         Logr.debug(str('\t' * depth) + str(nodes))
 
+        if not len(nodes):
+            return []
+
         top = nodes[0]
 
         # Merge into top