Get open grap from url with JSON

ogpxxx.js

  $('a#suggest_title').bind( "click", function(event) {
    event.preventDefault();
    // http://stackoverflow.com/questions/29997121/how-to-get-page-open-graph-metadata-via-jquery
    var ogPostUrl = $('input#post_url').val();
    $.getJSON("//query.yahooapis.com/v1/public/yql?" 
              + "q=SELECT%20*%20FROM%20html%20WHERE%20url=%27" 
              + encodeURIComponent(ogPostUrl) 
              + "%27%20AND%20xpath=%27descendant-or-self::meta%27"
              + "&format=json&callback=?"
    , function(data) {
      // `data`:`json` returned from request
      console.log(data);
      // filter returned `results.meta` array for
      // object having property `property`:`og:*` `meta` elements ;
      // and has `property` `og:image` 

      var title = $.grep(data.query.results.meta, function(image, key) {
        return image.hasOwnProperty("property") && image.property === "og:title"
      });
      if (title.length > 0) {
        console.log(title[0].property);
        $("#post-title").val(title[0].content);
      };

      var desc = $.grep(data.query.results.meta, function(image, key) {
        return image.hasOwnProperty("property") && image.property === "og:description"
      });
      if (desc.length > 0) {
        console.log(desc[0].property);
        $("#post-desc").text(desc[0].content);
      };
    });
  });

data.query should be check for null before data.query.results.meta sometime yahoo API return null answer on valid webpage