Return `null` from `get_term()` on taxonomy mismatch.

[34997] caused `get_term()` to return an error object in the case when
`$taxonomy` did not match the taxonomy of the located term. This was an
inadvertant change from the previous behavior, when `get_term()` would return
null in these cases.

Props dlh.
See #14162. Fixes #34332.
Built from https://develop.svn.wordpress.org/trunk@35227


git-svn-id: http://core.svn.wordpress.org/trunk@35193 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/taxonomy-functions.php

@@ -751,9 +751,9 @@ function get_term( $term, $taxonomy = '', $output = OBJECT, $filter = 'raw' ) {
 		// If there are two terms with the same ID, split the other one to a new term.
 		$new_term_id = _split_shared_term( $_term->term_id, $_term->term_taxonomy_id );
 
-		// If no split occurred, this is an invalid request.
+		// If no split occurred, this is an invalid request. Return null (not WP_Error) for back compat.
 		if ( $new_term_id === $_term->term_id ) {
-			return new WP_Error( 'invalid_term', __( 'Empty Term' ) );
+			return null;
 
 		// The term has been split. Refetch the term from the proper taxonomy.
 		} else {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-35226';
+$wp_version = '4.4-alpha-35227';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.