checkAtRule = function (atRule) {
  var test = '';
  atRule.forEach(function (atRuleItem) {
    if (!atRuleItem.is('block')) {
      test += selectorHelpers.constructSelector(atRuleItem);
    }
  });
  updateList(test, true, atRule.start.line, atRule.start.column);
}
Checks an atRule contents for selectors and calls our consstructSelector method

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