fix: handle absent release property in package.json

  function extract_release_config_from_package_json() {

    package_json="./package.json"

    if [[ -f "${package_json}" ]]; then

      node -pe "JSON.stringify(require('${package_json}').release, null, 2)"

      release_config=$(node -pe "JSON.stringify(require('${package_json}').release, null, 2)")

      case "$release_config" in

        "undefined"|"null") release_config="" ;;

      esac

      echo "$release_config"

    fi

  }