[bfss, migration] fix storage migration (closes #2189206) The storage migration intend to clean the attributes cache but in practice it was trying to discard attribut edition. As no attribut were edited this lead to a crash.

#! /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