[sql generation] fix exists table scope pb: when iterating other solutions inner to an EXISTS subquery, we should reset variables which have this exists node as scope

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#! /bin/sh -e

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if [ -x "/etc/init.d/cubicweb-ctl" ]; then

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    invoke-rc.d cubicweb-ctl restart || true

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fi

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#DEBHELPER#

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exit 0