message: fix: get spacing length of undefined
diff: @@ -35,7 +35,7 @@ export default (): Plugin => {
  if (!key || !value || !designKeyList.includes(key) || !plugin.isMatch!(key)) return atom
  - const spacing = styli.getTheme<string[]>('spacing')
  + const spacing = styli.getTheme<string[]>('spacing') || []
  if (!spacing.length) {
  console.error('theme spacing is not provide')
  