checkRuleset = function (ruleNode) {
  var ruleSet = '';
  ruleNode.forEach(function (ruleNodeItem) {
    if (!ruleNodeItem.is('block')) {
      if (ruleNodeItem.is('selector')) {
        ruleNodeItem.forEach(function (selectorContent) {
          ruleSet += selectorHelpers.constructSelector(selectorContent);
        });
      }
      else if (ruleNodeItem.is('delimiter') || ruleNodeItem.is('space')) {
        ruleSet += selectorHelpers.constructSelector(ruleNodeItem);
      }
    }
  });
  if (ruleSet !== '') {
    updateList(ruleSet, false, ruleNode.start.line, ruleNode.start.column);
  }
}
Checks a rulesets contents for selectors and calls our consstructSelector method

@param {object} ruleNode - The current node / part of our selector
@returns {undefined}