fixes bug on quitter.se, where getUrl returned 400 error for activity notices (which don't have url:s)
fixes bug on quitter.se, where getUrl returned 400 error for activity notices (which don't have url:s)

mitchellurgero/Qvitter,hannesmannerheim/qvitter,mitchellurgero/Qvitter,llebegue/qvitter,netzkombinat/Qvitter,GreenLunar/qvitter,llebegue/qvitter,hannesmannerheim/qvitter,GreenLunar/qvitter,netzkombinat/Qvitter