rule-indent: fix potential `forEach` loop bug
rule-indent: fix potential `forEach` loop bug

hudochenkov/csscomb.js,kriss145/csscomb.js,royriojas/csscomb.js,oceanzou123/csscomb.js,csscomb/csscomb.js,csscomb/csscomb.js,hugeinc/csscomb.js,ahumphreys87/csscomb.js,zyj1022/csscomb.js