nvm/test/slow/nvm reinstall-packages/works with no installs

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#!/bin/sh
die () { echo "$@" ; exit 1; }
\. ../../../nvm.sh
get_packages() {
npm list -g --depth=0 | \sed -e '1 d' -e 's/^.* \(.*\)@.*/\1/' -e '/^npm$/ d' | xargs
}
nvm use 4.7.2
ORIGINAL_PACKAGES=$(get_packages)
nvm reinstall-packages 4.7.1
FINAL_PACKAGES=$(get_packages)
[ -z "${ORIGINAL_PACKAGES}" ] || die "original packages were not empty: ${ORIGINAL_PACKAGES}"
[ -z "${FINAL_PACKAGES}" ] || die "final packages were not empty: ${FINAL_PACKAGES}"