Reference to flield_slideshow causes errors

I intermittently get field_slideshow is not installed when I run drush or in my error logs

the reference is in radix/template.php

could we do a simple module_exists

  // Add radix-field-slideshow when required.
  $field_slideshow = drupal_get_path('module', 'field_slideshow') . '/field_slideshow.js';
  $radix_field_slideshow = drupal_get_path('theme', 'radix') . '/assets/javascripts/radix-field-slideshow.js';
  if (!empty($javascript[$field_slideshow]) && empty($javascript[$radix_field_slideshow])) {
    $javascript[$radix_field_slideshow] = array_merge(
      drupal_js_defaults(), array('group' => JS_THEME, 'data' => $radix_field_slideshow))
  }