[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.
# -*- coding: utf-8 -*-
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s specific hooks and operations"""