Merge pull request 'Fix:Plugins-share:init.php - site_url is NULL when share...

Merge pull request 'Fix:Plugins-share:init.php - site_url is NULL when share article by URL from archived articles' (#35) from kdan/tt-rss:master into master

Reviewed-on: https://git.tt-rss.org/fox/tt-rss/pulls/35