Smile\ElasticsuiteCatalogRule\Model\Rule\Condition\Product\QueryBuilder::prepareFieldValue PHP Method

    private function prepareFieldValue(ProductCondition $productCondition)
    {
        $value = $productCondition->getValue();
        if (is_array($value)) {
            $value = array_filter($value);
        }
        $productCondition->setValue($value);
        return $this;
    }