Empty notes are resolution/reopen events

Author: adamsilverstein

src/wp-includes/pluggable.php

@@ -1746,11 +1746,6 @@ function wp_notify_postauthor( $comment_id, $deprecated = null ) {
 			return false;
 		}
 
-		// Skip notifications for empty notes.
-		if ( 'note' === $comment->comment_type && empty( $comment->comment_content ) ) {
-			return false;
-		}
-
 		$post   = get_post( $comment->comment_post_ID );
 		$author = get_userdata( $post->post_author );
 
@@ -1907,7 +1902,7 @@ function wp_notify_postauthor( $comment_id, $deprecated = null ) {
 					/* translators: %s: Note author email. */
 					$notify_message .= sprintf( __( 'Email: %s' ), $comment->comment_author_email ) . "\r\n";
 					/* translators: %s: Note text. */
-					$notify_message .= sprintf( __( 'Note: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n";
+					$notify_message .= sprintf( __( 'Note: %s' ), "\r\n" .  ( empty( $comment_content ) ? __( 'resolved/reopened' ) : $comment_content ) ) . "\r\n\r\n";
 					$notify_message .= __( 'You can see all notes on this post here:' ) . "\r\n";
 					/* translators: Note notification email subject. 1: Site title, 2: Post title. */
 					$subject = sprintf( __( '[%1$s] Note: "%2$s"' ), $blogname, $post->post_title );