# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1508880281 -7200
# Node ID aa6e36ed60eb17cc212e6e22439399c75b454581
# Parent  3463dddb812d36cedca31dfcf237df160a8c8a5a
Fixed recurrence date iterator.

diff -r 3463dddb812d -r aa6e36ed60eb imiptools/data.py
--- a/imiptools/data.py	Tue Oct 24 23:21:54 2017 +0200
+++ b/imiptools/data.py	Tue Oct 24 23:24:41 2017 +0200
@@ -1278,7 +1278,7 @@
 
     # Return a sorted list of the periods.
 
-    periods = list(MergingIterator([rule_periods, iter(rdates)]))
+    periods = list(MergingIterator([rule_periods, iter(rdates or [])]))
 
     # Exclude exception dates.