Fix empty children status.

[afoucret]

Fix for #565

[srenon]

@afoucret .... This commit will cause products to not show up because it will return false if status does not exist hence removing the product.

This code works better for me ...

            if(array_key_exists('status', $childrenData)){
                $enabled = current($childrenData['status']) == 1;
                if ($enabled === false) {
                    unset($childrenIndexData[$childrenId]);
                }
            }