Return false if object does not respond to url (#5988)
Return false if object does not respond to url (#5988)

Avoid error when the service returns a mostly valid oembed, but has no
url in it, causing a MethodError: undefined method `url'
for #<OEmbed::Response::Photo:0x000056505def9620>
kibousoft/mastodon,kibousoft/mastodon,kibousoft/mastodon,kibousoft/mastodon