[wp-trac] [WordPress Trac] #52814: Avoid notices in `get_post_comments_feed_link()`

[WordPress Trac]

#52814: Avoid notices in `get_post_comments_feed_link()`
--------------------------+-----------------------------
 Reporter:  dd32          |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  low           |  Milestone:  Awaiting Review
Component:  Feeds         |    Version:
 Severity:  trivial       |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 When an atom feed request is made to a non-existent page,
 get_post_comments_feed_link() produces PHP Notices such as the following:

 {{{
 E_NOTICE: Trying to get property 'post_type' of non-object in wp-includes
 /link-template.php:752
 }}}

 Example of a URLs which can trigger this is:
 {{{
 OPTIONS /2021/01/feed/atom/atom/
 GET /404-page/feed/atom/
 }}}
 (Options bypasses the canonical redirect, and outputs a post-comments feed
 for the page "2021/01/feed/atom")

 While the code path that results in this function being called without a
 valid post is unexpected and the resulting url generated in the atom feed
 is invalid, it silences these notices, which is good for sites that
 log/monitor these things (Such as WordPress.org)

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/52814>
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