sometimes expanded_url is blank
sometimes expanded_url is blank

ericscartier/twarc,kevinbgunn/twarc,miku/twarc,ericscartier/twarc,DocNow/twarc,hugovk/twarc,remagio/twarc,edsu/twarc,remagio/twarc,miku/twarc,kevinbgunn/twarc