[session] don't silently ignore commits
commits while in the precommit or postcommit phase are silently ignored.
This is OK in precommit since there'll be a commit afterwards anyway;
OTOH in postcommit it may surprise the developer who didn't read the
documentation for postcommit operations carefully enough. Related to
#4383922.
#! /bin/sh -e
if [ -x "/etc/init.d/cubicweb-ctl" ]; then
invoke-rc.d cubicweb-ctl restart || true
fi
#DEBHELPER#
exit 0