lib/less/visitors/to-css-visitor.js
function hasFakeRuleset(atRuleNode) {
            var bodyRules = atRuleNode.rules;
            return bodyRules.length === 1 && (!bodyRules[0].paths || bodyRules[0].paths.length === 0);
        }
function hasFakeRuleset(atRuleNode) {
            var bodyRules = atRuleNode.rules;
            return bodyRules.length === 1 && (!bodyRules[0].paths || bodyRules[0].paths.length === 0);
        }
function hasFakeRuleset ( atRuleNode ) { var bodyRules = atRuleNode . rules ; return bodyRules . length === 1 && ( ! bodyRules [ 0 ] . paths || bodyRules [ 0 ] . paths . length === 0 ) ; }
if there is only one nested ruleset and that one has no path, then it is just fake ruleset
if there is only one nested ruleset and that one has no path then it is just fake ruleset