Plugins: Return the original value in `apply_filters_deprecated()` if no filter is registered for the tag.

Props flixos90.
Fixes #10441.
Built from https://develop.svn.wordpress.org/trunk@37911


git-svn-id: http://core.svn.wordpress.org/trunk@37852 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/plugin.php

@@ -674,7 +674,7 @@ function remove_all_actions($tag, $priority = false) {
  */
 function apply_filters_deprecated( $tag, $args, $version, $replacement = false, $message = null ) {
 	if ( ! has_filter( $tag ) ) {
-		return;
+		return $args[0];
 	}
 
 	_deprecated_hook( $tag, $version, $replacement, $message );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37910';
+$wp_version = '4.6-alpha-37911';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.