Apply the new `'respond_link'` filter in `comments_popup_link()` if `$number` is `0` before outputting the URL.

Props joedolson.
Fixes #29454.

Built from https://develop.svn.wordpress.org/trunk@34216


git-svn-id: http://core.svn.wordpress.org/trunk@34180 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/comment-template.php

@@ -1341,11 +1341,22 @@ function comments_popup_link( $zero = false, $one = false, $more = false, $css_c
 			$home = get_option('siteurl');
 		echo $home . '/' . $wpcommentspopupfile . '?comments_popup=' . $id;
 		echo '" onclick="wpopen(this.href); return false"';
-	} else { // if comments_popup_script() is not in the template, display simple comment link
-		if ( 0 == $number )
-			echo get_permalink() . '#respond';
-		else
+	} else {
+		// if comments_popup_script() is not in the template, display simple comment link
+		if ( 0 == $number ) {
+			$respond_link = get_permalink() . '#respond';
+			/**
+			 * Filter the respond link when a post has no comments.
+			 *
+			 * @since 4.4.0
+			 *
+			 * @param string $respond_link The default response link.
+			 * @param integer $id The post ID.
+			 */
+			echo apply_filters( 'respond_link', $respond_link, $id );
+		} else {
 			comments_link();
+		}
 		echo '"';
 	}
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34215';
+$wp_version = '4.4-alpha-34216';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.