[rewrite] Fix crash when the main variable doesn't appear in the snippet's vargraph Also, the added test discover another bug once the first has been fixed (erroneous argument given to .rewrite recursive call). Closes #3661918

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#! /bin/sh -e

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case "$1" in

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    purge)

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	rm -rf /etc/cubicweb.d/

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	rm -rf /var/log/cubicweb/

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	rm -rf /var/lib/cubicweb/

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    ;;

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esac

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#DEBHELPER#

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exit 0