[bfss] Make ``current_fs_path`` return None when an attribute has no value current_fs_path was returning the future fspath when no value was defined. * This does not make any sense * This tricks the storage into believing that updating the attribute content is not necessary. The file was written but the attributes was not updated. as a result the assignement was not made. (close #1725446)

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#!/bin/sh -e

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if [ "$1" = "purge" ] ; then

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        update-rc.d cubicweb remove >/dev/null

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fi

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#DEBHELPER#

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exit 0