# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1515781998 -3600
# Node ID 8b0c1cf12f174101fd8a60c63f34aa867a13d3ee
# Parent  4c64472f46b28af94cc87d5d3e3efe394358903f
Support rule deletion where a null or empty rule is provided.

diff -r 4c64472f46b2 -r 8b0c1cf12f17 imiptools/data.py
--- a/imiptools/data.py	Fri Jan 12 19:20:38 2018 +0100
+++ b/imiptools/data.py	Fri Jan 12 19:33:18 2018 +0100
@@ -3,7 +3,7 @@
 """
 Interpretation of vCalendar content.
 
-Copyright (C) 2014, 2015, 2016, 2017 Paul Boddie <paul@boddie.org.uk>
+Copyright (C) 2014, 2015, 2016, 2017, 2018 Paul Boddie <paul@boddie.org.uk>
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -635,7 +635,10 @@
             return False
 
         old_rrule = self.get_item("RRULE")
-        self["RRULE"] = [rule]
+        if rule:
+            self["RRULE"] = [rule]
+        elif old_rrule:
+            del self["RRULE"]
         return old_rrule != rule
 
     def set_exceptions(self, exceptions):