[webrequest] simplify set_session code
Thanks to the previous changeset we are assured that session handed to
set_session is full featured one. This allows a simpler code for this method.
related to #2503918
#! /bin/sh -e
#
if [ "$1" = configure ]; then
if which install-docs >/dev/null 2>&1; then
install-docs -i /usr/share/doc-base/cubicweb-doc
fi
fi
#DEBHELPER#
exit 0