private function getSafeBlogKey($blogKey)
{
if ($blogKey == null) {
return PieCrustHelper::getDefaultBlogKey($this->pieCrust);
} else {
$blogKeys = $this->pieCrust->getConfig()->getValueUnchecked('site/blogs');
if (!in_array($blogKey, $blogKeys)) {
throw new PieCrustException("No such blog in the website: {$blogKey}");
}
return $blogKey;
}
}
