1 files changed, 1 insertions, 1 deletions
diff --git a/util.py b/util.py
index 4e9894ec..f3cdb814 100644
--- a/util.py
+++ b/util.py
@@ -40,7 +40,7 @@ def write_csv(fn, keys, rows):
     for row in rows:
       writer.writerow(row)
 
-def write_report(fn, title=None, keys=None, rows):
+def write_report(fn, title=None, keys=None, rows=[]):
   with open(fn, 'w') as f:
     f.write("<!doctype html>")
     f.write("<html>")