Ticket #19776: 19776.2.patch

wp-includes/category-template.php

@@ -337 +337 @@
         $class = esc_attr( $class );
         $id = $id ? esc_attr( $id ) : $name;
 
+        $output = '';
         if ( ! $r['hide_if_empty'] || ! empty($categories) )
                 $output = "<select name='$name' id='$id' class='$class' $tab_index_attribute>\n";
-        else
-                $output = '';
 
-        if ( empty($categories) && ! $r['hide_if_empty'] && !empty($show_option_none) ) {
+        if ( empty($categories) && ! $r['hide_if_empty'] ) {
+                $show_option_none = $show_option_none ? $show_option_none : __( 'No categories' );
                 $show_option_none = apply_filters( 'list_cats', $show_option_none );
                 $output .= "\t<option value='-1' selected='selected'>$show_option_none</option>\n";
         }