From d61646ffff43ed7517436631b360dd8bb92c328b Mon Sep 17 00:00:00 2001
From: Paolo Teti <paolo.teti@gmail.com>
Date: Tue, 2 Jun 2020 12:08:17 +0200
Subject: [PATCH] Network disc: avoid to raise an error if 'bus' or 'notifier'
 is None

If 'bus' is not connected yet and for other reasons an exception is
raised and some 'finally' block contains a call to disconnect() an
error is raised.
---
 canopen/network.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/canopen/network.py b/canopen/network.py
index 01bbc290..70f5c361 100644
--- a/canopen/network.py
+++ b/canopen/network.py
@@ -119,8 +119,10 @@ def disconnect(self):
         for node in self.nodes.values():
             if hasattr(node, "pdo"):
                 node.pdo.stop()
-        self.notifier.stop()
-        self.bus.shutdown()
+        if self.notifier is not None:
+            self.notifier.stop()
+        if self.bus is not None:
+            self.bus.shutdown()
         self.bus = None
         self.check()