PHP Warning: Parameter must be an array or an object that implements Countable

[slaFFik]

[23-Nov-2018 11:21:04 UTC] PHP Warning:  count(): Parameter must be an array or an object that implements Countable in ...\wordpress\trunk\wp-content\themes\twentynineteen\header.php on line 37

I'm on WordPress Nightly Build, 5.0-RC1-43944.

[joshfeck]

This error can be replicated:

• on a server with PHP 7.2
• by viewing a standard WP post that has a featured image set
• where WP_DEBUG is set to true

[glueckpress]

I left a comment in your PR, @joshfeck. 🙂

[kjellr]

Just noting that #679 is also open as a solution to this problem.

[garretthyder]

I took a look at #661 compared to #679 and feel 661 is overkill which the count function can simply be removed as the value is already numeric. Also 679 reduces characters as it appends the class. Cheers