/**
* Checks a string element of the record data array for existence and
* non-emptiness. If we are a date record, it'll be retrieved from the
* corresponding topic record.
*
* @param string $key key of the element to check
*
* @return bool TRUE if the corresponding string exists and is non-empty
*/
private function hasTopicString($key)
{
$result = FALSE;
if ($this->isTopicOkay()) {
$result = $this->topic->hasRecordPropertyString($key);
} else {
$result = $this->hasRecordPropertyString($key);
}
return $result;
}