Avoid race condition on client._conns in send() #1772
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There was a very small possibility that between checking
self._can_send_request(node_id)and grabbing the connection object viaself._conns[node_id]that the connection could get closed / recycled / removed from _conns and cause a KeyError. This PR should prevent such a KeyError. In the case where the connection is disconnected by the time we call send(), we should expect conn.send() simply to fail the request.This change is