catch unauthorized when executing rql to check an rql expression. Fix #968824
# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
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"""Common subpackage of cubicweb : defines library functions used both on the
hg stserver side and on the client side
"""