Base::extractValueSingle

static function extractValueSingle(FieldType $fieldType, array $field, array $request)
{
	static::cleanErrors();
	$result = static::extractValue($fieldType, $field, $request);
	if ($result === null || $result === '')
	{
		$nameText = $field['Field'] . '_text';
		$text = isset($request[$nameText]) ? $request[$nameText] : null;
		if (CBPActivity::isExpression($text))
			$result = $text;
	}

	return $result;
}