[session] raise proper exception with get_tx is called on a closed session
Prevent attribute error on _txs
Closes #2897836
#! /bin/sh -e
case "$1" in
purge)
rm -rf /etc/cubicweb.d/
rm -rf /var/log/cubicweb/
rm -rf /var/lib/cubicweb/
;;
esac
#DEBHELPER#
exit 0