Check for existence of post_type of posts

[Shady Sharaf]

Do not always assume that a new post's post_type exists / is registered.
ex:

wp_insert_post( array(
  'post_type' => 'non_registered_post_type'
) );

results in:

Notice: Trying to get property of non-object in /srv/www/wordpress-develop/src/wp-content/plugins/wp-stream/connectors/posts.php on line 144

Notice: Trying to get property of non-object in /srv/www/wordpress-develop/src/wp-content/plugins/wp-stream/connectors/posts.php on line 144