From a960140e2f3812131c6245cf12125509a024adbe Mon Sep 17 00:00:00 2001
From: bmbouter <bmbouter@gmail.com>
Date: Wed, 30 Nov 2016 13:32:32 -0300
Subject: [PATCH] Switch to using getattr in qpid.Transport.__del__ (#667)

The __init__ function calls verify_runtime_environment before setting
the use_async_interface variable.  If it throws an exception in that
function, the __del__ method will be called, and raises an
AttributeError

using getattr in the __del__ method to guard against this