"metadata_" is defined nowhere in the code snippet

[XiaoGuo, Liu]

https://developer.ubuntu.com/en/scopes/tutorials/scope-keywords/

the "metadata_" could be defined as follows:

auto metadata_ = search_metadata();

void MyQuery::run(SearchReplyProxy const& reply)
{
    if (metadata_.is_aggregated())
    {
        auto keywords = metadata_.aggregated_keywords();
        if (keywords.find("food") != keywords.end())
        {
            auto category = reply->register_category("food",
                                                     "CoolScope Food",
                                                     food_icon);
            do_food_search(reply, category);
        }
        else if (keywords.find("video") != keywords.end())
        {
            auto category = reply->register_category("video",
                                                     "CoolScope Videos",
                                                     videos_icon);
            do_video_search(reply, category);
        }
    }
    else
    {
        do_normal_search(reply);
    }
}