Disabled `indentation` rule yields TypeError

[ArmorDarks]

Seems that Stylefmt CLI doesn't recognise disabled Stylelint indentation rule in .stylelintrc because of null.

Example:

---
extends: stylelint-config-standard

rules:
  indentation: null

Yields

TypeError: Cannot read property '0' of null
    at getIndentationFromStylelintRules (J:\Work\Kotsu\node_modules\stylefmt\lib\params.js:41:30)
    at J:\Work\Kotsu\node_modules\stylefmt\lib\params.js:119:28

Please, note that null is suggested by Stylelint way of disabling rules