Guarantee router session is present for call to clientReply; properly free callbacks; attempt to set all necessary values for dbusers; do more to ensure buffers freed.

server/core/dbusers.c

@@ -1782,6 +1782,7 @@ static void *uh_keydup(void* key) {
 
 	if (current_key->resource)
 		rval->resource = strdup(current_key->resource);
+        else rval->resource = NULL;
 
 	return (void *) rval;
 }