Ticket #21977: p

Index: class-wp-xmlrpc-server.php
===================================================================
--- class-wp-xmlrpc-server.php  (revision 21954)
+++ class-wp-xmlrpc-server.php  (working copy)
@@ -1475,7 +1475,7 @@
                        if ( isset( $filter['order'] ) )
                                $query['order'] = $filter['order'];
                }
-               
+
                if ( isset( $filter['s'] ) ) {
                        $query['s'] = $filter['s'];
                }
@@ -1552,7 +1552,7 @@
                if ( empty( $term_data['name'] ) )
                        return new IXR_Error( 403, __( 'The term name cannot be empty.' ) );
 
-               if ( isset( $content_struct['parent'] ) ) {
+               if ( ! empty( $content_struct['parent'] ) ) {
                        if ( ! $taxonomy['hierarchical'] )
                                return new IXR_Error( 403, __( 'This taxonomy is not hierarchical.' ) );
 
@@ -1651,7 +1651,7 @@
                                return new IXR_Error( 403, __( 'The term name cannot be empty.' ) );
                }
 
-               if ( isset( $content_struct['parent'] ) ) {
+               if ( ! empty( $content_struct['parent'] ) ) {
                        if ( ! $taxonomy['hierarchical'] )
                                return new IXR_Error( 403, __( "This taxonomy is not hierarchical so you can't set a parent." ) );
 
@@ -5424,4 +5424,4 @@
 
                return $pingbacks;
        }
-}
+}
\ No newline at end of file