# HG changeset patch
# User Augie Fackler <raf@durin42.com>
# Date 1512928357 18000
# Node ID 6949fc164439d65b61542492293839648dda1609
# Parent  c586d02f7cdad2615a094fffa160a305779cd32d
hgclient: look for an open server before closing it in ResponseError block

At least some of the codepaths that can throw a ResponseError close
the server first (the one in _readchannel does so in order to detect
server startup failures, for example), so we have to verify we have a
server to close before doing so, otherwise we can lose the
ResponseError and the user sees an AttributeError when we try to use
.close() on a NoneType.

diff -r c586d02f7cda -r 6949fc164439 hglib/client.py
--- a/hglib/client.py	Sun Dec 10 12:50:57 2017 -0500
+++ b/hglib/client.py	Sun Dec 10 12:52:37 2017 -0500
@@ -271,7 +271,8 @@
         try:
             self._readhello()
         except error.ResponseError:
-            self.close()
+            if self.server is not None:
+                self._close()
             raise
         except error.ServerError:
             if self.server is None: