[This if-elseif-condition](https://github.com/indieweb/php-mf2/blob/master/Mf2/Parser.php#L412) should check `hasAttribute('alt')` and allow empty values rather than skipping if the alt is empty. Reference: http://pin13.net/mf2/?url=http%3A%2F%2Fmention-tech.appspot.com%2Ftesting.html "mention.tech" appended to end of 'org' and 'name' https://indiewebcamp.com/irc/2016-04-12#t1460485540966
This if-elseif-condition should check
hasAttribute('alt')and allow empty values rather than skipping if the alt is empty.Reference:
http://pin13.net/mf2/?url=http%3A%2F%2Fmention-tech.appspot.com%2Ftesting.html "mention.tech" appended to end of 'org' and 'name'
https://indiewebcamp.com/irc/2016-04-12#t1460485540966