Fix error:

Test Drupal\at_base\Config\Config->get() failed: <emclass="placeholder">Drupal\at_base\Config\NotFoundException:
atest_config.config#not_there in Drupal\at_base\Config\Config-&gt;get() (line 82 of /home/travis/build/drupal/sites/all/modules/at_base/lib/Config/Config.php).