# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1507324760 -7200
# Node ID c7204b035e66a8e0206e5317c9d1d03f3ffcfdfa
# Parent  8a08870781bb9cd6f884badb7dc142dea7136142
Test for SENT-BY before trying to delete it.

diff -r 8a08870781bb -r c7204b035e66 imiptools/client.py
--- a/imiptools/client.py	Fri Oct 06 19:34:42 2017 +0200
+++ b/imiptools/client.py	Fri Oct 06 23:19:20 2017 +0200
@@ -240,7 +240,7 @@
         if self.messenger:
             if self.messenger.sender != get_address(self.user):
                 attr["SENT-BY"] = get_uri(self.messenger.sender)
-            else:
+            elif attr.has_key("SENT-BY"):
                 del attr["SENT-BY"]
 
     def get_periods(self, obj, explicit_only=False, future_only=False):