Incoherent Type on Empty Media tag

[RayanZahab]

When Media tag is empty its returning an empty String instead of an empty array.

http://api.nytimes.com/svc/mostpopular/v2/mostviewed/all-sections/7.json?apikey=XYZ

{
"url":"https://www.nytimes.com/2018/05/17/style/royal-wedding-time-date.html",
"adx_keywords":"Royal Wedding;Weddings and Engagements;Time;Harry, Prince of Wales;Markle, Meghan",
"column":null,
"section":"Style",
"byline":"By THE NEW YORK TIMES",
"type":"Article",
"title":"What Time Was the Royal Wedding in My Time Zone?",
"abstract":"Interesting news: The royal wedding is now in the past. ",
"published_date":"2018-05-17",
"source":"The New York Times",
"id":100000005904642,
"asset_id":100000005904642,
"views":4,
"des_facet":[
"WEDDINGS AND ENGAGEMENTS",
"TIME"
],
"org_facet":"",
"per_facet":[
"HARRY, PRINCE OF WALES",
"MARKLE, MEGHAN"
],
"geo_facet":"",
"media":""
},