Index: mod/forum/lib.php
===================================================================
RCS file: /cvsroot/moodle/moodle/mod/forum/lib.php,v
retrieving revision 1.514
diff -u -r1.514 lib.php
--- mod/forum/lib.php	1 Dec 2006 05:21:22 -0000	1.514
+++ mod/forum/lib.php	11 Dec 2006 11:44:54 -0000
@@ -4436,6 +4436,14 @@
             notify($strreset.': '.get_string('resetsubscriptions','forum'), 'notifysuccess');
         }
     }
+    // Cleaning up: deleting forum discussions that have no posts in them
+    $sql = "DELETE FROM {$CFG->prefix}forum_discussions
+            WHERE firstpost NOT IN (
+                SELECT id FROM {$CFG->prefix}forum_posts
+            ) AND course = {$data->courseid}";
+    if (execute_sql($sql, false) and $showfeedback) {
+        notify($strreset.': '.get_string('resetdiscussions','forum'), 'notifysuccess');
+    }
 }