Fix possible AttribueError during conn._close_socket #1776
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Found via StackOverflow -- if user misconfigures BrokerConnection (for example attempts to use gssapi w/o module installed), we raise an exception immediately. But the configuration checks happen before
_sockis initialized, and the following gc call to__del__calls_close_socketwhich crashes on AttributeError. So this is a quick fix for that.This change is