No query fallback handling in Omega.

omega-no-query.php

<?php
// Allow themes to specify no-query fallback CSS files.
$mapping = omega_generate_asset_mapping($css);
foreach (preg_grep('/\.no-query(-rtl)?\.css/', $mapping) as $fallback) {
  // Don't modify browser settings if they have already been modified.
  if ($css[$mapping[$fallback]]['data'] == $fallback && $file['browsers']['IE'] && $file['browsers']['!IE']) {
    $file['browsers'] = array(
      '!IE' => FALSE,
      'IE' => 'lte IE 8',
    );
  }
}