Ticket #16465: 16465.patch

wp-includes/query.php

@@ -2181 +2181 @@
                                 $cat_query = wp_list_filter( $tax_query_in_and, array( 'taxonomy' => 'category' ) );
                                 if ( !empty( $cat_query ) ) {
                                         $cat_query = reset( $cat_query );
+                                        if ( !isset( $cat_query['terms'][0] ))
+                                                $cat_query['terms'][0] = '';
                                         $the_cat = get_term_by( $cat_query['field'], $cat_query['terms'][0], 'category' );
                                         if ( $the_cat ) {
                                                 $this->set( 'cat', $the_cat->term_id );
@@ -2193 +2195 @@
                                 $tag_query = wp_list_filter( $tax_query_in_and, array( 'taxonomy' => 'post_tag' ) );
                                 if ( !empty( $tag_query ) ) {
                                         $tag_query = reset( $tag_query );
+                                        if ( !isset( $tag_query['terms'][0] ))
+                                                $tag_query['terms'][0] = '';
                                         $the_tag = get_term_by( $tag_query['field'], $tag_query['terms'][0], 'post_tag' );
                                         if ( $the_tag ) {
                                                 $this->set( 'tag_id', $the_tag->term_id );