Site Health: Check that WordPress is installed before scheduling the HTTPS cron.

Trying to schedule cron jobs before WordPress is installed results in DB errors, which is suboptimal.

See #47577.


Built from https://develop.svn.wordpress.org/trunk@49909


git-svn-id: http://core.svn.wordpress.org/trunk@49608 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/https-detection.php

@@ -119,6 +119,10 @@ function wp_update_https_detection_errors() {
  * @access private
  */
 function wp_schedule_https_detection() {
+	if ( wp_installing() ) {
+		return;
+	}
+
 	if ( ! wp_next_scheduled( 'wp_https_detection' ) ) {
 		wp_schedule_event( time(), 'twicedaily', 'wp_https_detection' );
 	}