From bc3b0f03b97e6998cd5dc418932b94a1a1eeccf9 Mon Sep 17 00:00:00 2001
From: Brian Warner <warner@lothar.com>
Date: Sat, 3 Oct 2015 16:42:26 -0700
Subject: [PATCH] blocking/transit.py: hush a transient failure

Not entirely sure what's going on here, but this is probably safe.
---
 src/wormhole/blocking/transit.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/wormhole/blocking/transit.py b/src/wormhole/blocking/transit.py
index 718695a..49b6cce 100644
--- a/src/wormhole/blocking/transit.py
+++ b/src/wormhole/blocking/transit.py
@@ -387,7 +387,8 @@ class Common:
 
     def _connector_failed(self, hint):
         debug("- failed connector %s" % hint)
-        self._active_connectors.remove(hint)
+        # XXX this was .remove, and occasionally got KeyError
+        self._active_connectors.discard(hint)
         if not self._active_connectors:
             self._start_relay_connectors()