always return a string as owner_url 
always return a string as owner_url 

subsequent parsing may expect it
NickVolynkin/SmokeDetector,ArtOfCode-/SmokeDetector,ArtOfCode-/SmokeDetector,NickVolynkin/SmokeDetector,Charcoal-SE/SmokeDetector,Charcoal-SE/SmokeDetector