# HG changeset patch
# User Bryan O'Sullivan <bryano@fb.com>
# Date 1355167083 28800
# Node ID 9196638b08cee5a39d4b8d6b9054d0ff3cb48481
# Parent  40374059d227850ec2f5fb4f21a1b619136e2a6a
synthrepo: do not crash if a list is empty

diff -r 40374059d227 -r 9196638b08ce contrib/synthrepo.py
--- a/contrib/synthrepo.py	Tue Nov 27 22:24:02 2012 +0100
+++ b/contrib/synthrepo.py	Mon Dec 10 11:18:03 2012 -0800
@@ -231,6 +231,8 @@
     fp.close()
 
     def cdf(l):
+        if not l:
+            return [], []
         vals, probs = zip(*sorted(l, key=lambda x: x[1], reverse=True))
         t = float(sum(probs, 0))
         s, cdfs = 0, []