fix session's commit handling: when an operation failed in [pre]commit, call rollback_event as well for already processed operation, not only the revert<event> callback
"""cube-specific forms/views/actions/components
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""